Repair Stale MongoDB lock file for Satellite 6 pulp_streamer Service

Issue

• After a Satellite server crash, The Pulp streamer service fails during startup. Evidence of the failure appears as output similar to the following in /var/log/messages:

  May 29 15:16:29 sat6 pulp: pulp.server.db.connection:CRITICAL: Database initialization failed: localhost:27017: [Errno 111] 
  Connection refused
  May 29 15:16:29 sat6 pulp: pulp.server.webservices.application:CRITICAL:************************************
  May 29 15:16:29 sat6 pulp: pulp.server.webservices.application:ERROR: (29239-58688) The Pulp server encountered an 
  unexpected failure during initialization