pimd: Add support for displaying ip mroute

When you enter a static mroute under an interface
the 'show run' is not displaying this information.
Add code to allow this.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by: Daniel Walton <dwalton@cumulusnetworks.com>
Reviewed-by: Don Slice <dslice@cumulusnetworks.com>
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by: Daniel Walton <dwalton@cumulusnetworks.com>
Reviewed-by: Don Slice <dslice@cumulusnetworks.com>
Tested-by: NetDEF CI System <cisystem@netdef.org>
Acked-by: Jafar Al-Gharaibeh <jafar@atcorp.com>
3 files changed