Installer: Don't quote passwords when not subject to shell interpolation

[philipsd6]

ISSUE TYPE

• Bug Report

SUMMARY

When setting docker_registry_password either with -e or directly in the installer/inventory file, the installer fails when the docker registry authentication fails, because the value s3cr1t is passed as 's3cr1t' due to the changes introduced in #3987.

ENVIRONMENT

• AWX version: 13.0.0 (#bedbafe0f)
• AWX install method: docker on linux
• Ansible version: 2.8.12.post0
• Operating System: Ubuntu 19.10 local / RHEL 7.6 remote
• Web Browser: Firefox 78.0.2 (64-bit)

STEPS TO REPRODUCE

cd installer
ansible-playbook -i inventory -e docker_registry_password="s3cr1t" install.yml \
    --start-at-task="Authenticate with Docker registry if registry password given" -e "awx_version=13.0.0"

EXPECTED RESULTS

TASK [image_push : Authenticate with Docker registry if registry password given]
********************************************************************************
changed: [REMOTESERVER -> localhost]          

ACTUAL RESULTS

TASK [image_push : Authenticate with Docker registry if registry password given]
********************************************************************************
fatal: [REMOTESERVER -> localhost]: FAILED! => {"changed": false, "msg": "Logging into dockerhub.internal.site for user philipsd6 failed - 401 Client Error: Unauthorized (\"Get https://dockerhub.internal.site/v2/: unauthorized: BAD_CREDENTIAL\")"}                                                       

ADDITIONAL INFORMATION

The quote filter used in #3987 is appropriate for all the cases where passwords are exposed to the shell, via the shell or command module, or via templating into environment files. But this variable is supplied directly to the docker_image module, so it shouldn't be quoted.