This adds some details to the image cache page in the admin docs about
how image cache disk usage is (not) considered in the scheduler disk
space calculation. Workarounds and mitigation strategies are provided.
Change-Id: I7f40f167cea073a73cf249a9adfd73e1187c031b
Related-Bug: #1878024
Add a section to the support matrix for image caching
(``has_imagecache`` virt driver capability).
Change-Id: I9147c5ea6b276b4fe18a981f4360844009bd3d95
Partial-Bug: #1847302
Blueprint image-precache-support added a conf section called
[image_cache], so it makes sense to move all the existing image
cache-related conf options into it.
Old:
[DEFAULT]image_cache_manager_interval
[DEFAULT]image_cache_subdirectory_name
[DEFAULT]remove_unused_base_images
[DEFAULT]remove_unused_original_minimum_age_seconds
[libvirt]remove_unused_resized_minimum_age_seconds
New:
[image_cache]manager_interval
[image_cache]subdirectory_name
[image_cache]remove_unused_base_images
[image_cache]remove_unused_original_minimum_age_seconds
[image_cache]remove_unused_resized_minimum_age_seconds
Change-Id: I3c49825ac0d70152b6c8ee4c8ca01546265f4b80
Partial-Bug: #1847302