Remove qemu-dm-wrapper

xenopsd has its own copy; we haven't installed the copy from xen-api.git
in a while.

Signed-off-by: John Else <john.else@citrix.com>
Update .gitignore

Signed-off-by: John Else <john.else@citrix.com>
Merge pull request #2025 from johnelse/remove-qemu-wrapper

Remove qemu-dm-wrapper
CA-80791:WLB | perhaps vm-retrieve-wlb-recommendations should return host-uuids, to enable user to differentiate between same-named hosts

Signed-off-by: Cheng Zhang <cheng.zhang@citrix.com>