Fix errors Perforce post error when running under Python 3

Review Request #11061 — Created June 27, 2020 and submitted — Latest diff uploaded

Information

RBTools
release-1.0.x

Reviewers

Python 3 string must be encoded to bytes before being fed to p4.

Manually verified on Windows, Linux, and macOS that this resolves the error we were hitting when using Python 3.
Manually verified that this also still works fine for the same scenario when using Python 2.

Commits

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