Werk #2576: symantec_av_updates: fix crash due to missing datetime module, also handle DD.MM.YYYY date format

Component	Checks & agents
Title	symantec_av_updates: fix crash due to missing datetime module, also handle DD.MM.YYYY date format
Date	Sep 3, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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