Merge pull request #509 from xiaost-bytedance/master

［spooler］memory leak bugfix & simplified code
start unsubscribed
fixed rpc
added --pypy-ini-paste
added --pypy-paste and paste logging
improved embedding
fixed #513
allow building without ssl
CGI: search and set Status header in RFC 3875 compliant way.
fixed sni subscriptions
Merge pull request #514 from comel/cgi-fix

CGI: search and set Status header in RFC 3875 compliant way.
CGI: remove double header_size check.
Merge pull request #516 from comel/cgi-fix

CGI: remove double header_size check.
perl refactoring
fixed perl stacktrace usage
added first round of tests for psgi input with offset
positive tests for psgi input
improved heartbeat mode
check for heartbeat only if heartneat is enabled