Squashed 'files/external/vivid-planet-munin-php-apc/' changes from 6cfd0a6..fad2cfa

fad2cfa support named copies of the plugin
REVERT: 6cfd0a6 support named copies of the plugin

git-subtree-dir: files/external/vivid-planet-munin-php-apc
git-subtree-split: fad2cfabc6973999de3c273156a30a8d1d943133
Merge commit 'd1ac4d3cbf50669c9cd600488ab2d41ddf59fc5f'