Fix postgres-db initialization requires a password to start now

[hutchic]

docker-library/postgres#658

Before

docker-compose -f docker-compose-nexus.yml ps
      Name                     Command               State                                                           Ports
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
edgex-core-consul   docker-entrypoint.sh agent ...   Up       8300/tcp, 8301/tcp, 8301/udp, 8302/tcp, 8302/udp, 0.0.0.0:8400->8400/tcp, 0.0.0.0:8500->8500/tcp, 8600/tcp, 8600/udp
edgex-files         /bin/sh -c /usr/bin/tail - ...   Up
kong                /docker-entrypoint.sh /bin ...   Up       0.0.0.0:8000->8000/tcp, 0.0.0.0:8001->8001/tcp, 0.0.0.0:8443->8443/tcp, 0.0.0.0:8444->8444/tcp
kong-db             docker-entrypoint.sh postgres    Exit 1
kong-migrations     /docker-entrypoint.sh /bin ...   Up       8000/tcp, 8001/tcp, 8443/tcp, 8444/tcp
(failed reverse-i-search)`kong-db': cd ../^Cng-build-tools/
ubuntu@34:~/projects/edgex/developer-scripts/releases/nightly-build/compose-files$
ubuntu@34:~/projects/edgex/developer-scripts/releases/nightly-build/compose-files$
ubuntu@34:~/projects/edgex/developer-scripts/releases/nightly-build/compose-files$ docker-compose -f docker-compose-nexus.yml logs kong-db
Attaching to kong-db
kong-db                   | Error: Database is uninitialized and superuser password is not specified.
kong-db                   |        You must specify POSTGRES_PASSWORD for the superuser. Use
kong-db                   |        "-e POSTGRES_PASSWORD=password" to set it in "docker run".
kong-db                   |
kong-db                   |        You may also use POSTGRES_HOST_AUTH_METHOD=trust to allow all connections
kong-db                   |        without a password. This is *not* recommended. See PostgreSQL
kong-db                   |        documentation about "trust":
kong-db                   |        https://www.postgresql.org/docs/current/auth-trust.html
kong-db                   | Error: Database is uninitialized and superuser password is not specified.
kong-db                   |        You must specify POSTGRES_PASSWORD for the superuser. Use
kong-db                   |        "-e POSTGRES_PASSWORD=password" to set it in "docker run".
kong-db                   |
kong-db                   |        You may also use POSTGRES_HOST_AUTH_METHOD=trust to allow all connections
kong-db                   |        without a password. This is *not* recommended. See PostgreSQL
kong-db                   |        documentation about "trust":
kong-db                   |        https://www.postgresql.org/docs/current/auth-trust.html

After

docker-compose -f docker-compose-nexus.yml ps
      Name                     Command               State                                                           Ports
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
edgex-core-consul   docker-entrypoint.sh agent ...   Up       8300/tcp, 8301/tcp, 8301/udp, 8302/tcp, 8302/udp, 0.0.0.0:8400->8400/tcp, 0.0.0.0:8500->8500/tcp, 8600/tcp, 8600/udp
edgex-files         /bin/sh -c /usr/bin/tail - ...   Up
kong                /docker-entrypoint.sh /bin ...   Up       0.0.0.0:8000->8000/tcp, 0.0.0.0:8001->8001/tcp, 0.0.0.0:8443->8443/tcp, 0.0.0.0:8444->8444/tcp
kong-db             docker-entrypoint.sh postgres    Up       0.0.0.0:5432->5432/tcp
kong-migrations     /docker-entrypoint.sh /bin ...   Exit 0

Fixes edgexfoundry/blackbox-testing#389

[tingyuz]

lgtm