pimd: display down ports show ip pim interface

pimd: display down ports show ip pim interface

In show ip pim interface and  show ip pim interface <intf>
display State "down" pim enabled interfaces.

Ticket:CM-16809
Reviewed By:CCR-6398
Testing Done:
show ip pim interface
Interface  State          Address  PIM Nbrs           PIM DR  FHR IfChannels
br1           up          2.0.1.1         0            local    0          0
lo            up          6.0.0.1         0            local    0          0
pimreg        up          0.0.0.0         0            local    0          0
swp1        down          6.0.1.1         0            local    0          0
swp2          up          6.0.2.1         1            local    0          0

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>