Remove capabilities.enabled from test_host_filters

Update the unit tests to reflect the fact that capabilities will not be
returning enabled any more.  Leave capabilities.enabled in the json
filter tests, as even though capabilities.enabled isn't there the test
still checks the json filters functionality.

Part of bp no-compute-fanout-to-scheduler

Change-Id: Ia8d1dd1ac1ecf609586528f82d4c11650bb328c5
Merge "Remove capabilities.enabled from test_host_filters"