Pylint fixes for Brick iSCSI/LVM

Fixes a few of the more straightforward pylint errors
in these files.  (anomalous-backslash-in-string,
attribute-defined-outside-init, and bad-indentation)

Change-Id: Ic131717a83fe182fe578b63eccf364d300a8989c
Pylint fixes for GlusterFS driver

Remove unused 're' import
Remove unused parameter for _create_snapshot()

Change-Id: I40411b6206d282ae07c905faa44dcccecb45c120
Merge "Pylint fixes for GlusterFS driver"
Merge "Pylint fixes for Brick iSCSI/LVM"