Merge pull request #673 from mulesoft/MULE-7575

MULE-7575 - using the latest values from session properties in aggregato...
(cherry picked from commit 91f69234a762935e86e8fc2a11d09189d5665190)

Conflicts:
	transports/http/src/test/java/org/mule/transport/http/functional/SessionPropertiesWithMessageCollectionTestCase.java