[disks] Add file system for logical volumes and boot record

| partition | file system |
|-----------+-------------|
| root      | ext4        |
| swap      | swap        |
| nova      | xfs         |
| glance    | xfs         |
| boot raid | ext2        |
[tests] read_fixture method logs error message
[disks] add ability to define partition in release fixtures
[disks] Fix updating partitions, and size calculation for convertor
[disks] add tests for ceph
Disk label support for plain partitions in volume manager
Added Ceph OSD role
Fix flake8 issues
Unit test fixes for Ceph disk tests
More flake8 fixes
[disks] set volume file systems for RedHat and Ubuntu
pep8 and flake8 fixes
Restore ceph volume in fixture
Fix disk tests for ceph
Flake8 fixes