Squashed 'files/external/vivid-planet-munin-php-apc/' changes from 9e18ac3..6cfd0a6

6cfd0a6 support named copies of the plugin
REVERT: 9e18ac3 support named copies of the plugin, take 2
REVERT: b5aa024 support named copies of the plugin

git-subtree-dir: files/external/vivid-planet-munin-php-apc
git-subtree-split: 6cfd0a69aac8b3a4beafce567807455bfd9c8020
Merge commit '88b617a7cb62486a3db4db74d82003cb968f8e08'