lib: zclient.c remove extern struct thread_master *

zclient.c depended upon link time inclusion of a
extern struct thread_master *master.  This is a violation of the
namespace of the calling daemon.  If a library needs the pointer
pass it in and save it for future use.

This code change also makes the zclient code consistent with
the other lib functions that need to schedule work on your behalf

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
diff --git a/bgpd/bgp_zebra.h b/bgpd/bgp_zebra.h
index 8099193..50f727d 100644
--- a/bgpd/bgp_zebra.h
+++ b/bgpd/bgp_zebra.h
@@ -25,7 +25,7 @@
 
 extern struct stream *bgp_nexthop_buf;
 
-extern void bgp_zebra_init (void);
+extern void bgp_zebra_init (struct thread_master *master);
 extern int bgp_if_update_all (void);
 extern int bgp_config_write_maxpaths (struct vty *, struct bgp *, afi_t,
 				      safi_t, int *);