Added plugin to monitor dm-cache
Fixed type in dm-cache
s/voulme/volume
Merge pull request #551 from Am1GO/dm_cache

dm-cache monitoring
enable scaling for file size graph
fix graph_total configuration
add support note
Due to Logging API changes this plugins does not support Moodle 2.7 and newer versions
Fix issue when seconds is greater than two digits.

Also only use one query rather than a loop.
Report properly when value is undefined (slave error).
Fix issue when seconds is greater than two digits.

Also only use one query rather than a loop.
Report properly when value is undefined (slave error).
Made Munin plugin to graph signal levels from a Cisco EPC3010 cable modem
Added plugin to monitor dm-cache
Fixed type in dm-cache
s/voulme/volume
Merge remote branch 'origin/master'