MINOR: cli/fd: show fd's tgid and refcount in "show fd"

We really need to display these values now.
diff --git a/src/cli.c b/src/cli.c
index 722d0c6..07d104d 100644
--- a/src/cli.c
+++ b/src/cli.c
@@ -1304,7 +1304,7 @@
 			suspicious = 1;
 
 		chunk_printf(&trash,
-			     "  %5d : st=0x%06x(%c%c %c%c%c%c%c W:%c%c%c R:%c%c%c) tmask=0x%lx umask=0x%lx owner=%p iocb=%p(",
+			     "  %5d : st=0x%06x(%c%c %c%c%c%c%c W:%c%c%c R:%c%c%c) ref=%#x gid=%d tmask=0x%lx umask=0x%lx owner=%p iocb=%p(",
 			     fd,
 			     fdt.state,
 			     (fdt.state & FD_CLONED) ? 'C' : 'c',
@@ -1320,6 +1320,8 @@
 			     (fdt.state & FD_EV_SHUT_R) ? 'S' : 's',
 			     (fdt.state & FD_EV_READY_R)  ? 'R' : 'r',
 			     (fdt.state & FD_EV_ACTIVE_R) ? 'A' : 'a',
+			     (fdt.refc_tgid >> 4) & 0xffff,
+			     (fdt.refc_tgid) & 0xffff,
 			     fdt.thread_mask, fdt.update_mask,
 			     fdt.owner,
 			     fdt.iocb);