Don't remove RAID if it doesn't exist

Don't set raid_config to delete if raid does not exist

Break out of in_sync if expected and existing != 0 and raid_action is :delete

break out and return true in raid_in_sync if action == :delete

Don't update boot sequence if raic_action is delete

HDD will automatically be removed from the boot sequence when RAID volume is deleted
Boot seq will no be updated on raid deletion
Merge pull request #88 from logankimmel/ASM-2540_raid_remover

ASM-2540 Don't remove RAID if it doesn't exist