[TASK] Fix intermittent failures in SessionTest
[TASK] Fix intermittent failures in SessionTest

At time the garbageCollectionOnlyRemovesTheDefinedMaximumNumberOfSessions
in SessionTest fails with "Failed asserting that 1 matches expected 5."

Since the test is about making sure a maximum is not exceeded, this
changes the assertion from "equal" to "less than or equal".

Change-Id: I87c6d38dd3ddd7a4c5db838584a7249659fbac27
Releases: master, 2.2, 2.1
Original-Commit-Hash: 53f3eabd6afe0982b59c8c32746d88a60a204a9e

fcool/flow-development-collection,chewbakartik/flow-development-collection,albe/flow-development-collection,fcool/flow-development-collection,robertlemke/flow-development-collection,aertmann/flow-development-collection,dlubitz/flow-development-collection,kdambekalns/flow-development-collection,kitsunet/flow-development-collection,kdambekalns/flow-development-collection,dlubitz/flow-development-collection,albe/flow-development-collection,chewbakartik/flow-development-collection,gerhard-boden/flow-development-collection,bwaidelich/flow-development-collection,bwaidelich/flow-development-collection,dfeyer/flow-development-collection,mkeitsch/flow-development-collection,neos/flow-development-collection,neos/flow-development-collection,kitsunet/flow-development-collection,aertmann/flow-development-collection,dlubitz/flow-development-collection,fcool/flow-development-collection,mkeitsch/flow-development-collection,dfeyer/flow-development-collection,fcool/flow-development-collection,daniellienert/flow-development-collection,kdambekalns/flow-development-collection,aertmann/flow-development-collection,gerhard-boden/flow-development-collection,bwaidelich/flow-development-collection,robertlemke/flow-development-collection,robertlemke/flow-development-collection,daniellienert/flow-development-collection,kdambekalns/flow-development-collection,albe/flow-development-collection,daniellienert/flow-development-collection,gerhard-boden/flow-development-collection,neos/flow-development-collection,dfeyer/flow-development-collection,dfeyer/flow-development-collection,kitsunet/flow-development-collection,chewbakartik/flow-development-collection,mkeitsch/flow-development-collection,neos/flow-development-collection,robertlemke/flow-development-collection