Rebase to 10.2.15
    
    Don't use conditionals macros verided by the values outside the SPEC. They don't work thay way.
    Fix the server Recommends. They won't be parsed correctly, if they have whitespaces in front of them in contidional macros.
    Move the upstream systemd config file for tokudb to the correct location.
    Tweak the systemd unit files, to be closer to their upstream variants.
    Heavy update of the skipped tests list. PPC64le seems problematic lately. Spider tests are disabled in the first testsuite run as a whole testsuite, so no need to explicitly list them.
    Extend the testsuite timeout to 15 hours; 12 hours just wasn't enough for PPC64le; allow to retry failed test one time.
    Build with Jemalloc again. Require Jemalloc by TokuDB. Set precise version of Jemalloc library to systemd config for TokuDB.