Add some integration test for REST API

This removes: testlink #261, testlink #263 and testlink #264
testlink #262 was already covered.

Please note that the 401 error is not in the integration tests (see
testlink #263/3), however I've checked with Tuleap Release Manager and
it is ok as this test does not bring so much value.

Change-Id: I9db12b7afa48cbd698989d80968c58e1f230914c
Merge commit 'refs/changes/18/1818/1' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  Add some integration test for REST API

Change-Id: Ib327ba15bfed264ffca1154ca2d686e3ab9563dd
This is Tuleap 6.9.99.41

Change-Id: I2420c5b3486053500ff77315a22367a46542e5a8