[services-ng] support postgresql9.2

just rebase, no changes (compared to https://github.com/cloudfoundry/cf-release/pull/46)
    Add two blobs: postgresql9.2 and initdb9.2 (the OSS package is built using https://github.com/mflu/build_portable_postgresql )
    Add postgresql92 package
    Add postgresql.conf.erb in postgresql_node_ng job

test plan:
   - yeti-test plan 100/ plan 200
   - ad-hoc: backup test

Change-Id: Iaf2d985862f4097f9202a548560adf6381a37153