brotli partial response fix (#11087) #191

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	3m 24s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	34m 18s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	24m 28s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	25m 38s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	32m 28s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	33m 29s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	25m 49s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	25m 7s
	3h 24m 41s

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