Fix confluent startup error if dead
Fix confluent startup error if dead

Clean up stale dbg.sock if present rather than fail to start.  Also, if the pid indicated in pid file doesn't exist, ignore
the pidfile contents.

whowutwut/confluent,whowutwut/confluent,whowutwut/confluent,xcat2/confluent,xcat2/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent,whowutwut/confluent,jjohnson42/confluent