Revert "Move live_migration flag to libvirt section"

This reverts commit 0f8a5003882c09f24b802a01ba8bf14594a275cf.

Revert "Adding live migration"

This reverts commit 29ad37644c1757c3a0050b7cc4eda3a6be882224.

Add live_migration_flag to libvirt

Change-Id: I1d24c617d7afcdd0b44f2dc6f1b76c617260c2c1

Signed-off-by: David Medberry <openstack@medberry.net>