* Remove old proxies.
* Update README.

- Update to golang:1.15 to continue to get security fixes.
- Update from debian stretch to buster stay at latest stable to continue to get security fixes.
- Fix testcase in PythonActionLoopExtraTests.scala due to changed wording in the go runtime (https://github.com/apache/openwhisk-runtime-go/pull/131).

* use runtime from apache sources

* built also actionloop for pyhton3.7 ai

* use dockerskeleton:1.14.0 as base for pythonAction
* release prep: update NOTICE and CHANGELOG

* Remove python 2 tests, no longer maintained.
* Lookup test artifacts relative to project resources.
* Build test artifacts before tests.
* Build action loop proxy from source to get bug fix since last release

See https://github.com/apache/openwhisk/pull/4761.

Update gradlew[.bat] scripts from Gradle v5.5 release which
have proper Apache license headers and add corresponding
entry to LICENSE.txt.

* Update all files using Mini license header to use full ASF header

* fix broken link in dockerfile to released golang TAR

* fix broken link in dockerfile to released golang TAR

* move global variables initialized to init

* modify two test cases to initialize the return status

* modifiy python3Action Dockerfile and Tests

* helping python to find itself...

* adding a test to ensure sys.executable is valid

* fixed format

update python packages to be in sync with dockerskeleton

pickup changes for actionproxy action current directory /action