GUACAMOLE-600: Add RDP timeout client options.

guacamole-ext/src/main/resources/org/apache/guacamole/protocols/rdp.json

@@ -12,6 +12,10 @@
                 {
                     "name"  : "port",
                     "type"  : "NUMERIC"
+                },
+                {
+                    "name"  : "timeout",
+                    "type"  : "NUMERIC"
                 }
             ]
         },

guacamole/src/main/frontend/src/translations/en.json

@@ -647,6 +647,7 @@
         "FIELD_HEADER_SFTP_DISABLE_UPLOAD"        : "Disable file upload:",
         "FIELD_HEADER_SFTP_USERNAME"              : "Username:",
         "FIELD_HEADER_STATIC_CHANNELS" : "Static channel names:",
+        "FIELD_HEADER_TIMEOUT"         : "Connection timeout",
         "FIELD_HEADER_TIMEZONE"        : "Time zone:",
         "FIELD_HEADER_USERNAME"        : "Username:",
         "FIELD_HEADER_WIDTH"           : "Width:",