Calls xfs_admin instead of tune2fs when bundling xfs
Make xfs the default system for EL 7
Merge pull request #100 from Sarsate/xfs-support

Add support for xfs
Modifies xfs mount to ignore uuid.

Often, the bundled image shares the same UUID as the disk where
gcimagebundle is called. For xfs mounts, this causes
a uuid conflict when mounting the new image.

This modifies the mount to ignore the uuid when mounting.
Merge pull request #101 from Sarsate/no-uuid-conflicts

Modifies xfs mount to ignore uuid.
Sets default safe_format_and_mount fs of EL 7 to xfs.

safe_format_and_mount now uses xfs by default on EL 7 systems
Fixes minor bug in block_disk_test.py

MountFileSystem() constructor now takes correct number of arguments.
Merge pull request #103 from Sarsate/fix-unit-tests

Fixes minor bug in block_disk_test.py
Merge pull request #102 from Sarsate/xfs-safemount

Sets default safe_format_and_mount fs of EL 7 to xfs.
Bump version to 1.1.6