postgresql: remove version strings #122

Job	Run time
build_group1 (cgit)	24s
build_group1 (clr-installer-ci)	31s
build_group1 (golang)	8s
build_group1 (haproxy)	24s
build_group1 (httpd)	9s
build_group1 (iperf)	18s
build_group1 (machine-learning-ui)	16s
build_group1 (mariadb)	19s
build_group1 (memcached)	1s
build_group1 (mixer-ci)	19s
build_group1 (nginx)	11s
build_group1 (node)	19s
build_group1 (openjdk/8)	8s
build_group1 (openjdk/13)	11s
build_group1 (os-core)	5s
build_group1 (perl)	18s
build_group1 (php)	10s
build_group1 (php-fpm)	18s
build_group1 (postgres)	17s
build_group1 (python)	18s
build_group1 (rabbitmq)	17s
build_group1 (redis)	11s
build_group1 (ruby)	5s
	5m 37s

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