test: Start using GNU awk and fix archiving directory

test: Start using GNU awk and fix archiving directory

awk uses some tests that the native FreeBSD awk does not support:
    like: BEGIN{print 0 < 90}

And TESTDIR is not set when calling ceph-helpers from smoke.sh
    So fix with keeping the archive in /tmp

Signed-off-by: Willem Jan Withagen <wjw@digiware.nl>
(cherry picked from commit bfe7a2afaa5f41e785590d6315313553cadaf7dc)