Upgrade go, tf and python versions #1228

Job	Run time
Build	40s
Build	40s
Test docs up-to-date	57s
Test docs up-to-date	57s
Unit Tests	1m 39s
Unit Tests	1m 39s
Matrix Acceptance Tests (1.6.*)	10m 27s
Matrix Acceptance Tests (1.6.*)	7m 37s
Matrix Acceptance Tests (1.7.*)	4m 57s
Matrix Acceptance Tests (1.7.*)	4m 57s
Matrix Acceptance Tests (latest)	5m 22s
Matrix Acceptance Tests (latest)	5m 22s
Cleanup	0s
Cleanup	38s
CI Finished	0s
CI Finished	8s
	46m 0s

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