PowerVM hypervisor plugin
OpenVZ hypervisor plugin

Convert PowerVM hypervisor configuration in Nova to the new plugin setup.
Convert OpenVZ hypervisor configuration in Nova to the new plugin setup.
Merge branch 'config-local' into dt-test
Merge branch 'fix-get-packages' into dt-test
Merge branch 'hypervisor-others' into dt-test
Merge branch 'ldap-ad' into dt-test