HelpInputOutputValidator - Handle multiline default/example values in plugin specs

[igorski-r7]

Proposed Changes

Description

Describe the proposed changes:

As of Python 3 Script plugin got multiline default and example values in their strings. Validators started to be failing even if it was correct. In that case, it looks like it doesn't support newline delimiters at all in HelpInputOutputValidator. This update is to address that, so Python 3 Script update would fit fine for plugin validation.

PR Requirements

Developers, verify you have completed the following items by checking them off:

• Unit tests written for any new or updated code
• Version bumped within setup.py
• Changelog entry added

[snyk-io]

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