Add the artemis auth info as env variables in worker containers

[carbonin]

Requires ManageIQ/manageiq-pods#268

\cc @agrare

[miq-bot]

Checked commit carbonin@4f5eb85 with ruby 2.3.3, rubocop 0.52.0, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 0 offenses detected
Everything looks fine. 👍

[carbonin]

After this PR (and the dependent one) is merged the following environment variables will be available in all worker containers for using artemis:

ARTEMIS_SERVICE_PORT_STOMP=61613
ARTEMIS_USER=artemis
ARTEMIS_SERVICE_HOST=172.30.102.132
ARTEMIS_PASSWORD=RACAmGJU

ARTEMIS_SERVICE_PORT will also be available, but should be avoided for forward compatibility.
Artemis supports many protocols and we may add more than one to the same service.