pimd: Instate partial rp_list(when its full) to bsrp_list(main list).

pimd: Instate partial rp_list(when its full) to bsrp_list(main list).

When all rp received on a partial list, this routine is called.
if static rp configured for the group range
    if partial list is empty
         clean main list and partial list
    else
         replace main with partial and start the g2rp timer with head of new main
    return

if main list was empty
    call rp new with head of partial list and start g2rp timer.
else
    if partial list is empty
         call rp del
    else
         stop g2rp timer of old elected rp.
         call rp change with new rp(head of partial list) and start g2rp timer.

swap the lists and clean the old list(now partial list).

Signed-off-by: Saravanan K <saravanank@vmware.com>