update version to 0.16.2 (googleapis#532)

Bump gapic-generator version to pick up fix (googleapis#524)

* Pick up gapic-generator fix

* Update artman version in Dockerfile

Co-Authored-By: michaelbausor <michaelbausor@google.com>

bump gapic-generator version (googleapis#521)

remove print from setup.py and release 0.15.9 (googleapis#512)

release 0.15.8 (googleapis#510)

put openssh-client back, and release 0.15.7 (googleapis#506)

Release 0.15.6 (googleapis#505)

* release 0.15.6

* update commit hashes

release 0.15.5 (googleapis#501)

Prepare for 0.15.4 release (googleapis#497)

needed to pick up --dev_samples in gapic-generator (googleapis/gapic-generator#2304)

Prepare for 0.15.3 release (googleapis#496)

* prepare for 0.15.3 release
* remove experimental_features from test yaml file