Bug 1343903

Description of problem:
The section about Live Storage Migration (10.6.3) documents several restrictions on old DC/Cluster versions. While this was true in RHEV 3.6, it is no longer true in RHEV 4.0, and should be removed.

1. The note "IMPORTANT Live deletion of snapshots is not supported in data centers with a compatibility version below 3.5 [etc.]" does not relate to live storage migration at all, and needs to be removed in both 4.0 and 3.6's documentation.

2. The bullet "Live storage migration creates a snapshot" is technically true, but this snapshot is removed when LSM ends (see the RFE described in bug 1317434). It should probably be removed. The same point is re-echoed in 10.6.4's last sentence "If you moved a disk that is connected to a running virtual machine, a snapshot of that disk is created automatically, and is visible in the Snapshots tab of the details pane for that virtual machine. For information on removing the snapshot, see Deleting a Snaphot.", and should be removed there too.

3. The point about "In data centers with a compatibility version of 3.6, [etc.]" Is no longer relevant. RHEVM 4.0 only supports DCs of compatibility version 3.6 and 4.0, so this becomes a mute point - you can live migrate a disk from any domain to any other domain in the same DC. This point is re-echoed in section 10.6.4 "Moving a virtual disk" - "If the virtual machine is shut down, you can move disks between any two storage domains in the same data center. In data centers with a compatibility version of 3.6, you can also move disks attached to running virtual machine [etc.]". This point too should be removed.