Remove egctl auto change protocol

[suchen-sci]

For now, egctl automatically update http protocol to https protocol is response status code is 400 and response body contains HTTPS.

This strategy can cause some additional problem. As described in #1161 , if user create/update httpserver with yamls, then easegress-server may return status code of 400 and a response body with https in it (for example, some message about tls config). In this case, egctl will try to update protocol from http to https. Then will cause error of http: server gave HTTP response to HTTPS client.

So, this pr update this protocol change strategy. https://github.com/golang/go/blob/master/src/net/http/server.go#L1922-L1929 based on golang net/http implementation.

if err := tlsConn.HandshakeContext(ctx); err != nil {
	// If the handshake failed due to the client not speaking
	// TLS, assume they're speaking plaintext HTTP and write a
	// 400 response on the TLS conn's underlying net.Conn.
	if re, ok := err.(tls.RecordHeaderError); ok && re.Conn != nil && tlsRecordHeaderLooksLikeHTTP(re.RecordHeader) {
		io.WriteString(re.Conn, "HTTP/1.0 400 Bad Request\r\n\r\nClient sent an HTTP request to an HTTPS server.\n")
		re.Conn.Close()
		return
	}
	c.server.logf("http: TLS handshake error from %s: %v", c.rwc.RemoteAddr(), err)
	return
}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9e26c89) 81.18% compared to head (cc21908) 81.35%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1162      +/-   ##
==========================================
+ Coverage   81.18%   81.35%   +0.17%     
==========================================
  Files         149      149              
  Lines       16946    16946              
==========================================
+ Hits        13757    13787      +30     
+ Misses       2532     2508      -24     
+ Partials      657      651       -6     

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