[BUGFIX] SlaveRequestHandler must not ignore QUIT command

The ``SlaveRequestHandler`` listens for a "QUIT\n" command but
it trims the input first, removing the newline character.

Change-Id: I9b8813575b3c1b6c5d99e2ec0045442a7745b69f
Releases: master, 2.2, 2.1
Merge "[BUGFIX] SlaveRequestHandler must not ignore QUIT command"
Added .travis.yml

Change-Id: If3c059e5e4241ea82b6b7467e8ac8c067f968bfc