v1.1-rc1

Changelog

• a9e5d1c bind: rephrase --log-http usage
• 1bdbc3b cmd/forwarder/run: initialize runctx.Group with a function
• 5fce40a cmd/forwarder/run: register process metrics
• af5d444 http_proxy: add proxy errors metric
• 8088def http_proxy: make errorResponse func a proxy method
• f11b5b5 martian: add TestReadHeaderConnectionReset
• 8455fb6 martian: add isClosedConnError from http2
• 01e4130 martian: always close connection on readRequest error
• 4474a8d martian: modernize isClosedConnError
• 888aa15 martian: move readRequest error logging to handle
• 6da7936 martian: refactor isCloseable
• 2dece1d martian: use isClosedConnError instead of isCloseable outside of handleLoop
• 180744c runctx: allow to start group without notify signals
• 26a961f utlis/httpx: add RoundTripperFunc