Fix cmapi tests that blows systemd.

Eventually we got tests failure even using code with previous success test.
One of the tests starts (restarts) controllernode service more than 5 times in 10 seconds.
It exceeds unit (controllernode service) systemd start rate limiting. So unit can't be started more than DefaultStartLimitBurst (5) times before systemd DefaultStartLimitIntervalSec (10secs) has passed. More info HERE

I assume that something changed in aws machines or in the systemd config on that machines, but not totally sure.

So this test have to be simplified to not blowing systemd.