Werk #4419: check_form_submit: Deal with forms that provide the method as lower case string

Component	Checks & agents
Title	check_form_submit: Deal with forms that provide the method as lower case string
Date	Feb 28, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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