Merge branch 'km/imap-send-libcurl-options'

Now imap-send learned to talk to the server using cURL library,
allow the same GIT_CURL_VERBOSE environment variable to control the
verbosity of the chattering.

* km/imap-send-libcurl-options:
  imap-send.c: set CURLOPT_USE_SSL to CURLUSESSL_TRY
  imap-send.c: support GIT_CURL_VERBOSE

imap-send.c

@@ -1421,8 +1421,8 @@ static CURL *setup_curl(struct imap_server_conf *srvc)
 		strbuf_release(&auth);
 	}
 
-	if (server.use_ssl)
-		curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
+	if (!server.use_ssl)
+		curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
 
 	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, server.ssl_verify);
 	curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, server.ssl_verify);
@@ -1431,7 +1431,7 @@ static CURL *setup_curl(struct imap_server_conf *srvc)
 
 	curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
 
-	if (0 < verbosity)
+	if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
 		curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 
 	return curl;