Collect traces by aux_head and aux_tail

[bet4it]

According to https://github.com/torvalds/linux/commit/1627314fb54a33ebd23bd08f2e215eaed0f44712, in Linux after 4.20, PERF_RECORD_AUX won't supply enough information for us, we should use aux_head and aux_tail to collect traces. As I have said in https://github.com/hase-project/hase/pull/91#issuecomment-471319641, we assume the size of collected records will not greater than the buffer holds them now, so the implement here is really simple. We can add more checks in the future.

[Mic92]

In case you have not seen: https://github.com/hase-project/hase/issues/90#issue-406030112