Use skip_cert_verify to determine how to connect for all UAA connections

[#80878662]
Added VCAP_APPLICATION environment to the /v2/apps/:guid/env endpoint.

[#80664762]
Add /v2/apps/:guid/copy_bits endpoint.

- Bump API Version to 2.15.0
- Adds new error AppBitsCopyInvalid

[#78847148]
Update service plan for a single existing service instance

* allows user to curl -X PUT /v2/service_instances/:guid -d
* '{"service_plan_guid": "new-guid"}', and calls out to the broker
Bump vcap_common to 4.0.2.

- Also bumps vcap_common dependencies.

[#80456142]
Bump API Version to 2.16.0

[#78847148]
Push buildpack upload traffic through bcs

[#78477158]