Import RHEL's test Sanity/testsuite
    
    It's a wrapper for the upstream test suite.
    
    There's one small addition (already inherited from RHEL) covering
    but I'm keeping it here for convenience as it works with the upstream
    test suite too. I've slightly modified it to make it work beyond
    RHEL 8. The modification is based on the final upstream fix [1] and
    the related discussion in thread [2].
    
    [1] https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=6bf4a34047452f882c5cc66bd85812ee1bb5a41c
    [2] https://sourceware.org/pipermail/binutils/2018-August/104304.html