REORG: init: do MODE_CHECK_CONDITION logic first

REORG: init: do MODE_CHECK_CONDITION logic first

In MODE_CHECK_CONDITION we only parse check_condition string, provided by
'-cc', and then we evaluate it. Haproxy process terminates at the
end of {if..else} block anyway, if the test has failed or passed. So, it
will be more appropriate to perform MODE_CHECK_CONDITION test first and
then do all other process runtime mode verifications.