New upstream release varnish-6.2
    Removed patches merged upstream
    Remove misc sed hacks for bugs that are fixed upstream
    Added a patch for gcc-4.4 -Werror support on el6
    Added a patch from upstream to fix too small thread pool stack in a test
    Override macro __python to make brp-python-bytecompile choose python3
    Explicitly use python-3.4
    Switch to make_install macro
    Better documentation of patches
    Updated checkout of pkg-varnish-cache