[MINOR] stats: add "a link" & "a href" for sockets

This patch adds add "a link" & "a href" html tags for sockets.
As sockets may have the same name like servers, I decided to
add "+" char (forbidden in names assigned to servers), as a prefix.
diff --git a/src/dumpstats.c b/src/dumpstats.c
index 0751d5b..576566d 100644
--- a/src/dumpstats.c
+++ b/src/dumpstats.c
@@ -1406,7 +1406,8 @@
 			if (!(s->data_ctx.stats.flags & STAT_FMT_CSV)) {
 				chunk_printf(&msg,
 				     /* name, queue */
-				     "<tr class=socket><td class=ac>%s</td><td colspan=3></td>"
+				     "<tr class=socket><td class=ac><a name=\"%s/+%s\"></a>"
+				     "<a class=lfsb href=\"#%s/+%s\">%s</a></td><td colspan=3></td>"
 				     /* sessions rate: current, max, limit */
 				     "<td colspan=3>&nbsp;</td>"
 				     /* sessions: current, max, limit, total, lbtot */
@@ -1415,7 +1416,7 @@
 				     /* bytes: in, out */
 				     "<td>%s</td><td>%s</td>"
 				     "",
-				     l->name,
+				     px->id, l->name, px->id, l->name, l->name,
 				     U2H3(l->nbconn), U2H4(l->counters->conn_max), U2H5(l->maxconn),
 				     U2H6(l->counters->cum_conn), U2H7(l->counters->bytes_in), U2H8(l->counters->bytes_out));