Revert "Add clicommands to run unit- and style-tests"

This reverts commit 0805d73e34d3692ffb77a74c31bd04fbdb67ba27.
Add clicommands to run unit- and style-tests

refs #6092
Add support for multi-value options

Makes it possible to supply options multiple times and to supply the
"--" flag to indicate that there are no options anymore to parse

refs #6092