In some modules the global LOG is not used any more. And the import
of logging is not used. This patch removes the unused logging import
and LOG vars.
Change-Id: I28572c325f8c31ff38161010047bba00c5d5b833
Block backed images, are already presented as block devices, so
LocalBlockImages can be mounted directly instead of being linked
with loopback or nbd to another block device.
Change-Id: I5aae1e293832f7cff7bc00d793bcc86ededf5eec
Closes-bug: #1287754