postgresql: remove version strings #123

Job	Run time
build_group1 (cgit)	8s
build_group1 (clr-installer-ci)	13s
build_group1 (golang)	9s
build_group1 (haproxy)	10s
build_group1 (httpd)	9s
build_group1 (iperf)	8s
build_group1 (machine-learning-ui)	13s
build_group1 (mariadb)	8s
build_group1 (memcached)	9s
build_group1 (mixer-ci)	11s
build_group1 (nginx)	10s
build_group1 (node)	10s
build_group1 (openjdk/8)	13s
build_group1 (openjdk/13)	9s
build_group1 (os-core)	20s
build_group1 (perl)	11s
build_group1 (php)	9s
build_group1 (php-fpm)	9s
build_group1 (postgres)	9s
build_group1 (python)	10s
build_group1 (rabbitmq)	20s
build_group1 (redis)	9s
build_group1 (ruby)	21s
	4m 18s

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