Adding redhat init/service files to start pimd

Added missing pimd.init (for RedHat/CentOS <= 6) and
pimd.service (for RedHat/CentOS >= 7)

Signed-off-by: Martin Winter <mwinter@opensourcerouting.org>
diff --git a/redhat/Makefile.am b/redhat/Makefile.am
index 9612e91..94c8db0 100644
--- a/redhat/Makefile.am
+++ b/redhat/Makefile.am
@@ -3,4 +3,4 @@
 	isisd.service ospf6d.init ospf6d.service ospfd.init ospfd.service \
 	quagga.logrotate quagga.pam quagga.pam.stack quagga.spec \
 	quagga.sysconfig ripd.init ripd.service ripngd.init ripngd.service \
-	watchquagga.init zebra.init zebra.service
+	watchquagga.init pimd.init pimd.service zebra.init zebra.service