MULE-6731 - with big files and low polling frequency file inbound enpdoint consumes the same file several times
(cherry picked from commit 062621d7256f1304bbe0a9f39c11d634027fa687)

Conflicts:
	transports/file/src/main/java/org/mule/transport/file/FileMessageReceiver.java
	transports/file/src/main/java/org/mule/transport/file/ReceiverFileInputStream.java