Updates and fixes for local registry on faasd

[welteki]

Description

Fix some command examples that were failing because of a missing directory.
Add the --insecure-registry flag for the faasd-provider.

Motivation and Context

• I have raised an issue to propose this change (required)

How Has This Been Tested?

Types of changes

• 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)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have signed-off my commits with git commit -s

[alexellis]

Looks good - thanks @welteki