*: call if_init()/if_terminate() from vrf_init()/vrf_terminate()

Later, an interface will belong to a specific VRF, and the interface
initialization will be a part of the VRF initialization. So now call
if_init() from vrf_init(), and if_terminate() from vrf_terminate().

Daemons have the according changes:
- if if_init() was called or "iflist" was initialized, now call
  vrf_init() instead;
- if if_terminate() was called or "iflist" was destroyed, now call
  vrf_terminate() instead.

Signed-off-by: Feng Lu <lu.feng@6wind.com>
Reviewed-by: Alain Ritoux <alain.ritoux@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Vincent JARDIN <vincent.jardin@6wind.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/pimd/pimd.c b/pimd/pimd.c
index 855defc..78c3ff5 100644
--- a/pimd/pimd.c
+++ b/pimd/pimd.c
@@ -24,6 +24,7 @@
 
 #include "log.h"
 #include "memory.h"
+#include "vrf.h"
 
 #include "pimd.h"
 #include "pim_cmd.h"
@@ -130,12 +131,12 @@
   qpim_infinite_assert_metric.route_metric      = PIM_ASSERT_ROUTE_METRIC_MAX;
   qpim_infinite_assert_metric.ip_address        = qpim_inaddr_any;
 
-  pim_if_init();
   pim_cmd_init();
   pim_ssmpingd_init();
 }
 
 void pim_terminate()
 {
+  vrf_terminate();
   pim_free();
 }