Currently we properly close the ipv4 socket when we're check for nodes
to become available. This change adds additional closes to ensure we
clean up the sockets when we're done with them while we wait.
Note this code was removed in Ussuri so this is a <= train only patch
Change-Id: Ie1711972e2fdb2af80b50a2bf514fc46151ae4f3
Closes-Bug: #1888676