Pass p4 port, client, and password on the command line instead of using env.
The p4 client prefers, in order, arguments on the command line, .p4config

settings, and finally P4* environment variables. This meant that if someone had

a .p4config file, and then specified --p4-port and --p4-client with something

different, it wouldn't actually override their file.
I've changed the client implementation to use -p, -c, and -P arguments to 'p4'

instead of setting things in the environment.

Ran unit tests.