GUACAMOLE-600: Add SSH and SFTP timeout client options.

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

@@ -424,6 +424,10 @@
                     "name"  : "sftp-port",
                     "type"  : "NUMERIC"
                 },
+                {
+                    "name"  : "sftp-timeout",
+                    "type"  : "NUMERIC"
+                },
                 {
                     "name"  : "sftp-host-key",
                     "type"  : "TEXT"

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

@@ -16,6 +16,10 @@
                 {
                     "name"  : "host-key",
                     "type"  : "TEXT"
+                },
+                {
+                    "name"  : "timeout",
+                    "type"  : "NUMERIC"
                 }
             ]
         },

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

@@ -175,6 +175,10 @@
                     "name"  : "sftp-port",
                     "type"  : "NUMERIC"
                 },
+                {
+                    "name"  : "sftp-timeout",
+                    "type"  : "NUMERIC"
+                },
                 {
                     "name"  : "sftp-host-key",
                     "type"  : "TEXT"