databases/xtrabackup: 2.1.7 -> 2.2.6

http://www.percona.com/doc/percona-xtrabackup/2.2/release-notes.html

PR:		195164
Approved by:	maintainer (timeout)
Improve wording of some entries; explicitly mention cases when I've tried to
revive some broken ports, but their upstream had ceased.
- Replace continuous spaces with tabs
- Drop needless GH_PROJECT, link GH_TAGNAME to PORTVERSION
- Fix a typo in COMMENT and reword it; beautify pkg-descr
- Merge two USE_XORG's into one

Approved by:	kwm (timeout since Oct 24)
- Update to version 0.92.3 [1]
- Upstream switched to github [1]
- Remove leading article from COMMENT

PR:		194753 [1]
Submitted by:	maintainer [1]
Update "BSD" license in dns category
Update "BSD" license
Update "BSD" license
Update "BSD" license
Update "BSD" license
Update "BSD" license
- Update to 1.003002

Changes:	http://search.cpan.org/dist/JSON-MaybeXS/Changes
- Update to 0.7.1

Changes:	https://github.com/brightbox/fog-brightbox/blob/master/CHANGELOG.md
- Update to 2.10.1

Changes:	https://github.com/guard/guard/releases
- Update to 0.34

Changes:	http://search.cpan.org/dist/Math-GSL/Changes
- Update to 2.0.11

Changes:	http://sourceforge.net/projects/pymilter/files/pyspf/pyspf-2.0.11/README.txt/view
- Update to 1.08
- Strip shared library

Changes:	http://search.cpan.org/dist/Unicode-Collate/Changes
- Update to 2.1.11

Changes:	https://github.com/npm/npm/releases
- Sort PLIST
- Remove @comment