Be more lenient of symlinked /bin/sh inside the chroot (#16239)

Symlinks inside of the chroot were failng because we weren't able to
    determine if they were pointing to a real file or not.  We could write
    some complicated code to walk the symlink path taking into account where
    the root of the tree is but that could be fragile.  Since this is just
    a sanity check, instead we just assume that the chroot is fine if we
    find that /bin/sh in the chroot is a symlink.  Can revisit if it turns
    out that many chroots have a /bin/sh that's a broken symlink.

    Fixes #16097

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