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_signals.c b/pimd/pim_signals.c
index d1350b0..afd0259 100644
--- a/pimd/pim_signals.c
+++ b/pimd/pim_signals.c
@@ -36,7 +36,7 @@
 
 static void pim_sighup()
 {
-  zlog_debug ("SIGHUP received, ignoring");
+  zlog_info ("SIGHUP received, ignoring");
 }
 
 static void pim_sigint()
@@ -55,7 +55,7 @@
 
 static void pim_sigusr1()
 {
-  zlog_debug ("SIGUSR1 received");
+  zlog_info ("SIGUSR1 received");
   zlog_rotate (NULL);
 }