Update deletion error handling

[alexellis]

Signed-off-by: Alex Ellis [email protected]

Update deletion error handling

Description

Returns an error and exits if any of the functions get an error deleting in a stack.

Motivation and Context

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

openfaas/faas-netes#66

How Has This Been Tested?

With latest release of faas-netes

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
• I have added tests to cover my changes.
• All new and existing tests passed.