software/slapos-testing: make postgresql available for tests

exposing environment variable SLAPOS_TEST_POSTGRESQL_PREFIX containing
the location where postgresql is installed

software/slapos-testing/buildout.hash.cfg

@@ -15,4 +15,4 @@
 
 [template]
 filename = instance.cfg
-md5sum = 84bd6729e9b299c457cea2d1be6d05a4
+md5sum = 597c29546519aabe7259e416d0b92095

software/slapos-testing/instance.cfg

@@ -92,6 +92,7 @@ template = inline:
   export SLAPOS_TEST_IPV6=$${slap-configuration:ipv6-random}
   export SLAPOS_TEST_EGGS_DIRECTORY=$${buildout:eggs-directory}
   export SLAPOS_TEST_DEVELOP_EGGS_DIRECTORY=$${buildout:develop-eggs-directory}
+  export SLAPOS_TEST_POSTGRESQL_PREFIX=${postgresql:location}
 
 
 [slapos-test-runner-dot-nxdtest]

software/slapos-testing/software.cfg

@@ -17,6 +17,7 @@ extends =
   ../../component/sed/buildout.cfg
   ../../component/grep/buildout.cfg
   ../../component/userhosts/buildout.cfg
+  ../../component/postgresql/buildout.cfg
   ../../stack/slapos.cfg
   ../../stack/caucase/buildout.cfg
   ../../stack/nxdtest.cfg