Merge pull request #178 from mulesoft/MULE-7116

MULE-7116 - removing fixed reference to the connector WorkManager so the...(cherry picked from commit d91b4dcc0a875c10394d66cd45fddbadd018fe8b)
(cherry picked from commit 7371a18ff164b39a10ff8d490aa2b74a867d33e2)

Conflicts:
	core/src/main/java/org/mule/transport/AbstractMessageReceiver.java