Clean up couch_replicator_httpc_pool pid on error
Clean up couch_replicator_httpc_pool pid on error

db_open cleans up the couch_replicator_httpc_pool process
if an error occurs accessing the remote Db.

BugzID: 27202

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb