http2: simplify subsequent rstStream calls
Do not call destroy each time rstStream is called since the first call (or receipt of rst frame) will always trigger destroy. Expand existing test for this behaviour.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
http2, test