Change the admin node's bootenv from local to disk.
Install Postgres.
Fix up barclamp_install to deal with postgres.
Merge pull request #1912 from VictorLowther/pull-req-master-1894f0c22097ce2fe14718ee0722577a3af82967

https://github.com/crowbar/crowbar/pull/1912

Merged by devtool for cloudedge