Upgrade to postgres 10.6

- use awx-python in shebang in dev env
  - scl enable where needed for rhel7 & container installs
  - use scram-sha-256 pg user hashing by default
  - ensure psycopg2 is using the correct PG_CONFIG at build time for the right libpq version

installer/inventory

@@ -84,6 +84,7 @@ pg_username=awx
 # pg_password should be random 10 character alphanumeric string, when postgresql is running on kubernetes
 # NB: it's a limitation of the "official" postgres helm chart
 pg_password=awxpass
+pg_admin_password=postgrespass
 pg_database=awx
 pg_port=5432
 #pg_sslmode=require