feat: lock() accepts an optional userId

[palazzem]

Related Issues

• Closes Add support for main units that require the userId code #141

Proposed Changes:

Adds user_id optional parameter to lock(). This change adds support for all main units that require the userId parameter during the unit authentication.

Testing:

n/a

Extra Notes (optional):

n/a

Checklist

• Related issues and proposed changes are filled
• Tests are defining the correct and expected behavior
• Code is well-documented via docstrings

[coveralls]

Pull Request Test Coverage Report for Build 7758596374

• 0 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 7758383549:	0.0%
Covered Lines:	381
Relevant Lines:	381

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💛 - Coveralls