2021-September-12 - Prerelease - 2.6.379

Fix deployment handling of postgres user password (#9613)

* Fix deployment handling of postgres user password

(1) Change auth type of postgres user from 'peer' to 'md5'.
Peer uses the system account's password for authentication. Because
the postgres system user has no password, seemingly this is why
auth failed for the postgres user.

(2) Deploy pg_hba.conf file, this contains the setting of
how we authenticate the postgres user.

(3) Supply postgres user password for additional DB deployment commands

* Add README.md note explaining .orig files