Calling instance move on an unsupported hypervisor crashes HVA

[Metallion]

Instance migration is currently only implemented for KVM. Trying to run it on OpenVZ causes the following.

2016-09-16 05:47:51 JobContext thr=JobWorker[0/1] [ERROR]: Job failed e11447e17b50621d9aad645afff0f14bd78e95c5 [ run_vol_store ]: Unknown method: Dcmgr::Drivers::Openvz#run_migration_instance
2016-09-16 05:47:51 JobContext thr=JobWorker[0/1] [ERROR]: Caught RuntimeError: Unknown method: Dcmgr::Drivers::Openvz#run_migration_instance
        /opt/axsh/wakame-vdc/dcmgr/lib/dcmgr/task.rb:169:in `invoke!'
        /opt/axsh/wakame-vdc/dcmgr/lib/dcmgr/task.rb:249:in `invoke'
        /opt/axsh/wakame-vdc/dcmgr/lib/dcmgr/rpc/migration_handler.rb:26:in `block in <class:MigrationHandler>'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/runner/rpc_server.rb:69:in `instance_eval'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/runner/rpc_server.rb:69:in `block in job'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/rack/proc.rb:25:in `instance_eval'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/rack/proc.rb:25:in `call'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/rack/map.rb:52:in `call'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/rack/map.rb:52:in `call'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/rack/builder.rb:36:in `call'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/rack/job.rb:59:in `block (2 levels) in call'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/node_modules/job_worker.rb:67:in `call'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/node_modules/job_worker.rb:67:in `block in start'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/thread_pool.rb:32:in `call'
        /opt/axsh/wakame-vdc/dcmgr/vendor/bundle/ruby/2.0.0/gems/isono-0.2.20/lib/isono/thread_pool.rb:32:in `block (2 levels) in initialize'
I, [2016-09-16T05:47:51.867601 #1919]  INFO -- HvaHandler: Session ID: e11447e17b50621d9aad645afff0f14bd78e95c5: Instance UUID: i-8ljq6xbd: teminating instance

HVA on the target host will crash and then try to delete an instance that doesn't exist.