postgresql: remove version strings #113

Job	Run time
build_group1 (cgit)	15s
build_group1 (clr-installer-ci)	15s
build_group1 (golang)	11s
build_group1 (haproxy)	11s
build_group1 (httpd)	10s
build_group1 (iperf)	13s
build_group1 (machine-learning-ui)	18s
build_group1 (mariadb)	9s
build_group1 (memcached)	11s
build_group1 (mixer-ci)	14s
build_group1 (nginx)	9s
build_group1 (node)	10s
build_group1 (openjdk/8)	11s
build_group1 (openjdk/13)	23s
build_group1 (os-core)	14s
build_group1 (perl)	8s
build_group1 (php)	10s
build_group1 (php-fpm)	9s
build_group1 (postgres)	9s
build_group1 (python)	10s
build_group1 (rabbitmq)	8s
build_group1 (redis)	9s
build_group1 (ruby)	14s
	4m 31s

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