Revert "Read packet as much as possible"
Revert "Read packet as much as possible"

This reverts commit 544ee97e76025fb2a8415771db77d485c95c21ac.

nickfajones/ngtcp2,ngtcp2/ngtcp2,nickfajones/ngtcp2,ngtcp2/ngtcp2,nickfajones/ngtcp2,ngtcp2/ngtcp2