Pass no-name-constraint to repospanner ca init
    
    As explained in the documentation and error messages when run with Go1.9 compiled binaries,
    there's a Go bug in Go1.9 and earlier that breaks the name constraint.
    This should make the tests work on EL7 compiled binaries of repoSpanner.
    
    Signed-off-by: Patrick Uiterwijk <patrick@puiterwijk.org></patrick@puiterwijk.org>