Post filter protocol support

[p-a-s-c-a-l]

Add common protocol support functions (#153) for post filter (#149)

[ci-cismet-de]

Integrated branch 'feature/159-post-filter-protocol-support (9fd86a8)' into 'dev (5a9e487)' -- Build 741

[ci-cismet-de]

Integrated branch 'feature/159-post-filter-protocol-support (e0b476a)' into 'dev (136565f)' -- Build 748

[ci-cismet-de]

Integrated branch 'feature/159-post-filter-protocol-support (a682410)' into 'dev (59a9519)' -- Build 751