A few man pages were already in place. This patch uses the --help
output from each executable to seed a man page for the rest of the
executables, which include:
- glance
- glance-cache-cleaner
- glance-cache-manage
- glance-cache-prefetcher
- glance-cache-pruner
- glance-cache-queue-image
- glance-control
- glance-scrubber
Fixes bug 911291.
Change-Id: Ie0de990ff6617e7eb953f270a089c99bc340b4fe
58532a4373