dispatcher: add more unit tests (#1032)
dispatcher: add more unit tests (#1032)

Description: adding more tests in the Http::Dispatcher to exercise different interleavings of double Dispatcher::streamReset(stream) calls. Everything behaves as expected.
Risk Level: low test only PR
Testing: additional tests

Signed-off-by: Jose Nino <ca94e32c82b10963d0ce6eadf427a615ff7d1c0b@lyft.com>
envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile