Merge pull request #6054 from sarav511/dr2ndr

pimd: When DR becomes non DR, Still sends register packets to RP

diff --cc pimd/pim_iface.c
Simple merge

diff --cc pimd/pim_neighbor.c
Simple merge

diff --cc pimd/pim_pim.c
Simple merge

diff --cc pimd/pim_register.c
Simple merge

diff --cc pimd/pim_upstream.c
Simple merge