Update Go libraries #304

Job	Run time
Build client image	1m 11s
Build httpd+cgi image	18s
Build server image	1m 12s
Run test scripts (cert_handling.sh)	2m 24s
Run test scripts (cfengine.sh)	2m 14s
Run test scripts (change_ca.sh)	1m 56s
Run test scripts (client_timing.sh)	1m 47s
Run test scripts (clones.sh)	1m 42s
Run test scripts (powershell.sh)	2m 19s
Run test scripts (homepage.sh)	1m 40s
Tag and release	0s
Publish httpd+cgi image	0s
Publish server image	0s
	16m 43s

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