Improves the unit test coverage for dcmanager's orchestrator/states/kube_rootca
functionality.
Test plan:
All of the tests were created taking into account the
output of 'tox -c tox.ini -e cover' command
Story: 2007082
Task: 49306
Change-Id: If43ff65e0b225c044f8f15ef7e97ecb8397e75a0
Signed-off-by: rlima <Raphael.Lima@windriver.com>