Werk #7067: mail: escape notification context

Component	Notifications
Title	mail: escape notification context
Date	Mar 20, 2019
Level	Trivial Change
Class	Security Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p14 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The notification context which contains e.g. the host name and the service description is now escaped properly, i.e. '<' is replaced by '<' and so on. Only the HTML section which can be specified in the options of a notification rule is not escaped.

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