MINOR: activity: rename confusing poll_* fields in the output

We have poll_drop, poll_dead and poll_skip which are confusingly named
like their poll_io and poll_exp counterparts except that they are not
per poll() call but per-fd. This patch renames them to poll_drop_fd(),
poll_dead_fd() and poll_skip_fd() for this reason.
diff --git a/include/haproxy/activity-t.h b/include/haproxy/activity-t.h
index 4e2f9f0..77840dc 100644
--- a/include/haproxy/activity-t.h
+++ b/include/haproxy/activity-t.h
@@ -42,9 +42,9 @@
 	unsigned int wake_signal;  // pending signal prevented poll() from sleeping
 	unsigned int poll_io;      // number of times poll() reported I/O events
 	unsigned int poll_exp;     // number of times poll() sees an expired timeout (includes wake_*)
-	unsigned int poll_drop;    // poller dropped a dead FD from the update list
-	unsigned int poll_dead;    // poller woke up with a dead FD
-	unsigned int poll_skip;    // poller skipped another thread's FD
+	unsigned int poll_drop_fd; // poller dropped a dead FD from the update list
+	unsigned int poll_dead_fd; // poller woke up with a dead FD
+	unsigned int poll_skip_fd; // poller skipped another thread's FD
 	unsigned int conn_dead;    // conn_fd_handler woke up on an FD indicating a dead connection
 	unsigned int stream;       // calls to process_stream()
 	unsigned int ctxsw;        // total number of context switches
diff --git a/src/cli.c b/src/cli.c
index 1939ec3..528f935 100644
--- a/src/cli.c
+++ b/src/cli.c
@@ -1131,9 +1131,9 @@
 	chunk_appendf(&trash, "wake_signal:");  SHOW_TOT(thr, activity[thr].wake_signal);
 	chunk_appendf(&trash, "poll_io:");      SHOW_TOT(thr, activity[thr].poll_io);
 	chunk_appendf(&trash, "poll_exp:");     SHOW_TOT(thr, activity[thr].poll_exp);
-	chunk_appendf(&trash, "poll_drop:");    SHOW_TOT(thr, activity[thr].poll_drop);
-	chunk_appendf(&trash, "poll_dead:");    SHOW_TOT(thr, activity[thr].poll_dead);
-	chunk_appendf(&trash, "poll_skip:");    SHOW_TOT(thr, activity[thr].poll_skip);
+	chunk_appendf(&trash, "poll_drop_fd:"); SHOW_TOT(thr, activity[thr].poll_drop_fd);
+	chunk_appendf(&trash, "poll_dead_fd:"); SHOW_TOT(thr, activity[thr].poll_dead_fd);
+	chunk_appendf(&trash, "poll_skip_fd:"); SHOW_TOT(thr, activity[thr].poll_skip_fd);
 	chunk_appendf(&trash, "conn_dead:");    SHOW_TOT(thr, activity[thr].conn_dead);
 	chunk_appendf(&trash, "stream:");       SHOW_TOT(thr, activity[thr].stream);
 	chunk_appendf(&trash, "pool_fail:");    SHOW_TOT(thr, activity[thr].pool_fail);
diff --git a/src/ev_epoll.c b/src/ev_epoll.c
index e5437a2..5102b10 100644
--- a/src/ev_epoll.c
+++ b/src/ev_epoll.c
@@ -142,7 +142,7 @@
 
 		_HA_ATOMIC_AND(&fdtab[fd].update_mask, ~tid_bit);
 		if (!fdtab[fd].owner) {
-			activity[tid].poll_drop++;
+			activity[tid].poll_drop_fd++;
 			continue;
 		}
 
@@ -208,13 +208,13 @@
 		fd = epoll_events[count].data.fd;
 
 		if (!fdtab[fd].owner) {
-			activity[tid].poll_dead++;
+			activity[tid].poll_dead_fd++;
 			continue;
 		}
 
 		if (!(fdtab[fd].thread_mask & tid_bit)) {
 			/* FD has been migrated */
-			activity[tid].poll_skip++;
+			activity[tid].poll_skip_fd++;
 			epoll_ctl(epoll_fd[tid], EPOLL_CTL_DEL, fd, &ev);
 			_HA_ATOMIC_AND(&polled_mask[fd].poll_recv, ~tid_bit);
 			_HA_ATOMIC_AND(&polled_mask[fd].poll_send, ~tid_bit);
diff --git a/src/ev_evports.c b/src/ev_evports.c
index 50d9a1e..a008135 100644
--- a/src/ev_evports.c
+++ b/src/ev_evports.c
@@ -125,7 +125,7 @@
 
 		_HA_ATOMIC_AND(&fdtab[fd].update_mask, ~tid_bit);
 		if (fdtab[fd].owner == NULL) {
-			activity[tid].poll_drop++;
+			activity[tid].poll_drop_fd++;
 			continue;
 		}
 
@@ -217,12 +217,12 @@
 		events = evports_evlist[i].portev_events;
 
 		if (fdtab[fd].owner == NULL) {
-			activity[tid].poll_dead++;
+			activity[tid].poll_dead_fd++;
 			continue;
 		}
 
 		if (!(fdtab[fd].thread_mask & tid_bit)) {
-			activity[tid].poll_skip++;
+			activity[tid].poll_skip_fd++;
 			continue;
 		}
 
diff --git a/src/ev_kqueue.c b/src/ev_kqueue.c
index 9df987a..539394e 100644
--- a/src/ev_kqueue.c
+++ b/src/ev_kqueue.c
@@ -101,7 +101,7 @@
 
 		_HA_ATOMIC_AND(&fdtab[fd].update_mask, ~tid_bit);
 		if (!fdtab[fd].owner) {
-			activity[tid].poll_drop++;
+			activity[tid].poll_drop_fd++;
 			continue;
 		}
 		changes = _update_fd(fd, changes);
@@ -184,12 +184,12 @@
 		fd = kev[count].ident;
 
 		if (!fdtab[fd].owner) {
-			activity[tid].poll_dead++;
+			activity[tid].poll_dead_fd++;
 			continue;
 		}
 
 		if (!(fdtab[fd].thread_mask & tid_bit)) {
-			activity[tid].poll_skip++;
+			activity[tid].poll_skip_fd++;
 			continue;
 		}
 
diff --git a/src/ev_poll.c b/src/ev_poll.c
index 69368ce..e63334e 100644
--- a/src/ev_poll.c
+++ b/src/ev_poll.c
@@ -114,7 +114,7 @@
 
 		_HA_ATOMIC_AND(&fdtab[fd].update_mask, ~tid_bit);
 		if (!fdtab[fd].owner) {
-			activity[tid].poll_drop++;
+			activity[tid].poll_drop_fd++;
 			continue;
 		}
 		_update_fd(fd, &max_add_fd);
@@ -190,7 +190,7 @@
 				}
 
 				if (!(fdtab[fd].thread_mask & tid_bit)) {
-					activity[tid].poll_skip++;
+					activity[tid].poll_skip_fd++;
 					continue;
 				}
 
@@ -226,7 +226,7 @@
 		status--;
 
 		if (!fdtab[fd].owner) {
-			activity[tid].poll_dead++;
+			activity[tid].poll_dead_fd++;
 			continue;
 		}
 
diff --git a/src/ev_select.c b/src/ev_select.c
index d79f09b..544b7f2 100644
--- a/src/ev_select.c
+++ b/src/ev_select.c
@@ -106,7 +106,7 @@
 
 		_HA_ATOMIC_AND(&fdtab[fd].update_mask, ~tid_bit);
 		if (!fdtab[fd].owner) {
-			activity[tid].poll_drop++;
+			activity[tid].poll_drop_fd++;
 			continue;
 		}
 		_update_fd(fd, &max_add_fd);
@@ -198,12 +198,12 @@
 			unsigned int n = 0;
 
 			if (!fdtab[fd].owner) {
-				activity[tid].poll_dead++;
+				activity[tid].poll_dead_fd++;
 				continue;
 			}
 
 			if (!(fdtab[fd].thread_mask & tid_bit)) {
-				activity[tid].poll_skip++;
+				activity[tid].poll_skip_fd++;
 				continue;
 			}