pimd: Cleanup zebra debugs to be protected by debug commands

pimd is very chatty without any pim debugs turned on.
This commit fixes a bunch of the debugs to be protected
by appropriate pim debug statement.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
diff --git a/pimd/pim_neighbor.c b/pimd/pim_neighbor.c
index 72a3538..8932dc3 100644
--- a/pimd/pim_neighbor.c
+++ b/pimd/pim_neighbor.c
@@ -125,7 +125,7 @@
   /* DR changed ? */
   if (old_dr_addr.s_addr != pim_ifp->pim_dr_addr.s_addr) {
 
-    /* if (PIM_DEBUG_PIM_EVENTS) */ {
+    if (PIM_DEBUG_PIM_EVENTS) {
       char dr_old_str[100];
       char dr_new_str[100];
       pim_inet4_dump("<old_dr?>", old_dr_addr, dr_old_str, sizeof(dr_old_str));