Change ComputeHost table to filter on host field

ComputeHost table was trying to filter on a field that didn't exist
leading to a template rendering error when the filter was applied, so
this patch changes from 'service.type' to 'service.host' as the filtered
field.

Change-Id: I66a47a98f4005689b7be73bec46fa3ea4b9472af
Closes-Bug: 1390089
Add support for locking and unlocking servers

Partially implements: blueprint lock-unlock-server

Change-Id: I6d261cc7fb314bda60f0732f7a7bb3b23ba7c179
Merge "Change ComputeHost table to filter on host field"
Merge "Add support for locking and unlocking servers"
Merge branch 'master' of https://github.com/openstack/horizon