Rename SolidFire driver for consistency

Rename driver to SolidFireDriver for consistency.

Fixes: bug #1136081
Change-Id: I83aef90706474e8a079ab5247b72b33c7a2c8472
Fixes Opt types in cinder/backup/drivers/ceph.py

Changed backup_ceph_chunk_size, backup_ceph_stripe_unit and
backup_ceph_stripe_count from StrOpt to IntOpt.

Change-Id: I30a0b4d905b41f00e6450bc5cbfbf0c4d8593ab3
Merge "Fixes Opt types in cinder/backup/drivers/ceph.py"
Merge "Rename SolidFire driver for consistency"