allow for a prefix so we can specify ENV variables
use the prefix for os-api sensu checks
check_glance_store check
allow for 'disabled' checks
check-glance-store check instantiated - disabled for now
add check_glance_store.py to sensu sudoers
sensu_check supports env_vars
check_glance_store uses GLANCE_IMAGE_STORE env_var
enable check-glance-store sensu
rename check-glance-store.py
check-glance-store.py: pep8
sensu_check: fix set_arg_to_bool use before definition
sensu_check: fix env_vars not provided case
style: num line chars, compact horizontal code
monitoring: controller tasks whitespace cleanup
Merge pull request #458 from blueboxgroup/sensu-prefix

Monitoring: allow prefixing commands in sensu_check, add glance store check