Test manual-mode while enabling DNSSEC

Test manual-mode while enabling DNSSEC

Similar to previous commit.

Parametrize each test case and in case of manual-mode, execute
additional checks. First a keymgr run should not change the existing
key state (with exceptions of timing events such as moving from
RUMOURED to OMNIPRESENT, and from UNRETENTIVE to HIDDEN). Appropriate
messages must be logged.

After enforcing the next step with 'rndc dnssec -step', the key state
should be the same as if the step were to be taken automatically.