Add exec.d support for private cloud pre-install customization
add interface for subordinate charm to provide image modification scripts
Merge pull request #19 from mikemccracken/add-image-modifier-hook

add interface for subordinate charm to provide image modification scripts
Merge pull request #17 from mikemccracken/add-execd

Add exec.d support for private cloud pre-install customization
Do not remove polling cron job if glance endpoint is not found.
log when polling isn't killed because glance isn't there