Improve handling of PKTDROP chunks. This includes the input validation to address two issues found by ossfuzz testing the userland stack: * https://oss-fuzz.com/testcase-detail/5387560242380800 * https://oss-fuzz.com/testcase-detail/4887954068865024 and adding support for I-DATA chunks in addition to DATA chunks.
Improve handling of PKTDROP chunks. This includes the input validation
to address two issues found by ossfuzz testing the userland stack:
* https://oss-fuzz.com/testcase-detail/5387560242380800
* https://oss-fuzz.com/testcase-detail/4887954068865024
and adding support for I-DATA chunks in addition to DATA chunks.

sctplab/stream-reset-improved,sctplab/stream-reset-improved