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/ospfd/ospf_zebra.h b/ospfd/ospf_zebra.h
index 148f652..32a0271 100644
--- a/ospfd/ospf_zebra.h
+++ b/ospfd/ospf_zebra.h
@@ -72,7 +72,7 @@
 			      const char *, const char *);
 extern int ospf_distance_unset (struct vty *, struct ospf *, const char *,
 				const char *, const char *);
-extern void ospf_zebra_init (void);
+extern void ospf_zebra_init (struct thread_master *);
 
 #endif /* _ZEBRA_OSPF_ZEBRA_H */