Add tests for underscore handling

Add tests for the convert_underscores option
to CommandManager.

Change-Id: I5f91bb539bce69936ea86f7a370df2412c3a913c
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
add style checks to tests

Change-Id: I34990c619e66df21148f28bc6d6d743332a4fa16
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>