Update docker images to use openfaas namespace

[burtonr]

Signed-off-by: Burton Rheutan rheutan7@gmail.com

Description

Update to use openfaas as the docker hub repository/namespace to remain consistent with the rest of the openfaas core functionality images. This was brought to light when the TravisCI build failed trying to tag images labeled incorrectly.

Motivation and Context

• [ ] I have raised an issue to propose this change (required) Found and discussed on Slack

How Has This Been Tested?

Types of changes

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change) No issue reported, but the travis build was failing due to conflicting namespaces between functions and openfaas. Decided on Slack to use openfaas

Checklist:

• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I've read the CONTRIBUTION guide
• [X] I have signed-off my commits with git commit -s
• [ ] I have added tests to cover my changes.
• [X] All new and existing tests passed.