Werk #3420: check_ftp, check_tcp, check_smtp: add missing CRIT levels for certificate live time

Component	Checks & agents
Title	check_ftp, check_tcp, check_smtp: add missing CRIT levels for certificate live time
Date	Apr 22, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Thanks to Gregor Hoffleit.

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