security/monkeysphere: update 0.41 to 0.42

• Makefile
  
  adopt the port; pet portlint; remove comment about 'applying patches' on the post-patch stage; unmute post-patch.
• files/*
  
  patch src/share/mh/revoke_keys, to use gpg2; move patch-gpg2 (410 lines), and split it to have separated patches; regen all patches using makepatch.

Approved by: rene (mentor)
Differential Revision: https://reviews.freebsd.org/D18871