Remove short socket timeout workaround for VM blocking problem

The svmpd event server in the VM has been fixed to no longer block on a
single connection, which previously prevented any new connections to that
VM if the old client connection was still lingering in a zombie state.

Now the VM will keep accepting new socket connections from the server,
each time kicking off whatever old previous connection might still be
shuffling around, so we don't need the short timeout workaround any
more.

Change-Id: I74e14b90c4dfaacd050a9230fd298f82583c6365
Fixed session interval issue that caused crash

Fixed issue with session check intervals that would occasionally
run for a connection that had been closed and cause a NPE crash.