add test mount shared volume with instance.
add shunit2.
add ssh login to test_image_backup_just_for_boot_volume
delete function before_create_instance.
add ssh login to test_image_backup_just_for_boot_volume_and_second_blank_volume.
fix test_image_backup_just_for_boot_volume_and_second_blank_volume.
add volumes_args for create instance with second volume.
add check the backup second volume.
add ssh login to test_volume_backup_second_blank_volume.
fix assertEquals.
uncomment job.
fix t.volume.shared.backup.sh.
change default blank_volume_size parameter.
Merge pull request #384 from axsh/fix-shared-volume-instance

Fix shared volume instance