The previous behavior compressed files, then customized the horizon
install. By doing this, static files in the customization modules were
left out of the static collection/compression process. This change in
ordering will now catch those files.
Additionally, a notification is sent to the apache restart handler.
Change-Id: I5c6678c2ef93b46f38cf94f19c9b2cf444411ea8
Closes-Bug: #1598146