Less sensitive "empty config test"

Less sensitive "empty config test"

Do not store the content of "empty config" but only check
that none of "our elements" are not there when they
shouldn't. The "check empty config" approach is not valid
because the "empty config" stored at the beginning may change
when another feature gets installed while the test is still
running.

Change-Id: Ib28f60a8ae9fdf705599b9db5a0cca6c7e75708b
Signed-off-by: Jozef Behran <jbehran@cisco.com>