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merge revision(s) 60123,60172,60189,60208,60210,60211: [Backport #14005]

    webrick: avoid unnecessary IO#sync= call

    Sockets and pipes are always created with FMODE_SYNC flag
    already set (otherwise many things would be broken).

    * lib/webrick/server.rb (accept_client): remove unnecessary
      IO#sync= call

    webrick: do not hang acceptor on slow TLS connections

    OpenSSL::SSL::SSLSocket#accept may block indefinitely on clients
    which negotiate the TCP connection, but fail (or are slow) to
    negotiate the subsequent TLS handshake.  This prevents the
    multi-threaded WEBrick server from accepting other connections.

    Since the TLS handshake (via OpenSSL::SSL::SSLSocket#accept)
    consists of normal read/write traffic over TCP, handle it in the
    per-client thread, instead.

    Furthermore, using non-blocking accept() is useful for non-TLS
    sockets anyways because spurious wakeups are possible from
    select(2).

    * lib/webrick/server.rb (accept_client): use TCPServer#accept_nonblock
      and remove OpenSSL::SSL::SSLSocket#accept call
    * lib/webrick/server.rb (start_thread): call OpenSSL::SSL::SSLSocket#accept
    * test/webrick/test_ssl_server.rb (test_slow_connect): new test
      [ruby-core:83221] [Bug #14005]

    webrick: fix up r60172

    By making the socket non-blocking in r60172, TLS/SSL negotiation
    via the SSL_accept function must handle non-blocking sockets
    properly and retry on SSL_ERROR_WANT_READ/SSL_ERROR_WANT_WRITE.
    OpenSSL::SSL::SSLSocket#accept cannot do that properly with a
    non-blocking socket, so it must use non-blocking logic of
    OpenSSL::SSL::SSLSocket#accept_nonblock.

    Thanks to MSP-Greg (Greg L) for finding this.

    * lib/webrick/server.rb (start_thread): use SSL_accept properly
      with non-blocking socket.
      [Bug #14013] [Bug #14005]

    webrick: fix up r60172 and revert r60189

    Thanks to MSP-Greg (Greg L) for helping with this.

    * lib/webrick/server.rb (start_thread): ignore ECONNRESET, ECONNABORTED,
      EPROTO, and EINVAL on TLS negotiation errors the same way they
      were ignored before r60172 in the accept_client method of the
      main acceptor thread.
      [Bug #14013] [Bug #14005]

    webrick: fix up r60172 and r60208

    Thanks to MSP-Greg (Greg L) for helping with this.

    * lib/webrick/server.rb (start_thread): fix non-local return
      introduced in r60208

    webrick: fix up r60172 and r60210

    Thanks to MSP-Greg (Greg L) for helping with this.

    * lib/webrick/server.rb (start_thread): properly fix non-local return
      introduced in r60208 and r60210

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@61239 b2dd03c8-39d4-4d8f-98ff-823fe69b080e