CONTROLLER-1811: Fix IT hang in startup archetype

The IT uses the local karaf distro which adds the feature to
the featuresBoot which seems to cause an issue as the test code
also installs the feature. I also changed the test to just install
the impl feature and not the rest feature as the latter is not needed
for IT.

Change-Id: I471c1c1bef444f528f2703b0931416fb3dfcf6cd
Signed-off-by: Tom Pantelis <tompantelis@gmail.com>