Change 14611

Request Review
Support setting values in the registry through P4Ruby.
The command P4.set_env( var, val ) will set a registry variably on platforms
that support this action or through an exception on Unix.
The command P4.set_env( var ) resets a registry variable.

Updated unit test '02_environment.rb' to include registry set/check.

User visible change to be documented in release notes.
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