FIX: If no Disk service cv_linux throw exception

If you don't have Disk service register with current host the plugin
will throw an exception when printing "Service found",
s.get_full_name().

This commit prevent printing this message if service isn't found.
Merge pull request #35 from lermit/master

FIX: If no Disk service cv_linux throw exception
Fix: dont allow webui module to touch bottle before being really called
Merge branch 'master' of github.com:shinken-monitoring/mod-webui
Fix: bad daemon property name make webui dont start
Fix test. See naparuba@a790fb22231d653ff3f1cda76f0efb680655a257
Merge branch 'master' into develop