scanning disks should detect previously existing btrfs filesystems on the system. #488
update disk model to save the optional uuid of the pool it belongs to, if any.
update disk api to save pool uuid of a disk during scan. #488
save pool uuid in the model. #488
Add low level function to wipe btrfs meta data on a disk.
add helper to list snapshots
Add low level helper for importing pools
Add new command 'btrfs-wipe' to force wipe btrfs fs metadata on a disk.
Add stub code for automatic pool import
Add icon for the disks if the pool is null.

Fixes #488
Add functionality to handle btrfs wipe.

Fixes #488
Add btrfs import icon and functionality for the disks.

Fixes #488
#488. Add btrfs_wipe command to disk commands
Fixes #488. Add stub import command.
Merge pull request #494 from schakrava/issue#488_import_pools_shares

Issue#488 import pools shares
Merge branch 'issue#492_snapshot_rollback' of git://github.com/schakrava/rockstor-core into schakrava-issue#492_snapshot_rollback
Add read-field to add snapshot page.

Fixes #492
Merge branch 'issue#492_snapshot_rollback' of git://github.com/schakrava/rockstor-core into schakrava-issue#492_snapshot_rollback
Add writable field to add snapshot form and change roll back functionality ad per the writable value.

Fixes: #492