Added support for specifying custom fields in /v2/info endpoint.
Refactor space summary to use bulk api from hm9k

- Refactor away from instances_reporter_factory to
  composite_instances_reporter
- Modify space_summaries_controller to use bulk api
- Chunk max app requests from CC to HM to avoid NATS message limits
- Return -1 instead of 0 when an error occurs
- Stub bulk api availability check until hm9k support is available

[#69738916]

Signed-off-by: Julian Friedman <julz.friedman@uk.ibm.com>
Add api endpoint for killing a specific application instance

* DELETE to /v2/app/:guid/instances/:index where index is the index
  of the instance you wish to kill, 0 indexed.
* Update api documentation for application end points

[#72353100]
Run unit specs before integration and api specs
Merge remote-tracking branch 'origin/pr/228'

Conflicts:
	spec/controllers/runtime/info_controller_spec.rb