Removed restart tests from blackbox group

Removing the restart tests from the integration blackbox group. This
test has been causing intermittent failures due to an indeterministic
interaction with upstart, so pulling it out of the group until we figure
out a long term fix.

Fixes bug: bug/1204235

Change-Id: I6d95ba9c0946fb31a219c0d00438f42b636599c1