On python 2, running rbt --help <command> and rbt <command> --help

are equivalent. However, running rbt <command> --help does not work

on python 3. This happens because byte strings are utilized in the

code to see if --help or -h are passed in as arguments. They are

never found because the code is trying to find b'--help' or b'-h'.

In python 2, b'--help' is equivalent to '--help', but in python 3,

this is not the case.
To fix this issue, the byte strings b'--help' and b’-h’ have been

changed to python 3 compatible strings (i.e. --help and -h). Unit

tests have also been added to ensure that all possible positions and

cases of the 'help' argument work for rbtools.(ex. rbt —help <command>,

rbt <command> -h, rbt help <command>, etc.).
All tests were run using both python 2.7.17 and python 3.7.6.

Test cases run on python 2.7.17 and 3.7.6:

Test case where rbt help <command> is run

Test case where rbt <command> --help or rbt <command> -h is run

Test case where rbt --help <command> or rbt -h <command> is run

Test case where an invalid rbt command is run with help

Test case where multiple arguments are entered