GUACAMOLE-1290: Add parameter for SSH public key.

Author: necouchman

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

@@ -38,6 +38,10 @@
                 {
                     "name"  : "passphrase",
                     "type"  : "PASSWORD"
+                },
+                {
+                    "name"  : "public-key"
+                    "type"  : "MULTILINE"
                 }
             ]
         },

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

@@ -741,6 +741,7 @@
         "FIELD_HEADER_PASSPHRASE"    : "Passphrase:",
         "FIELD_HEADER_PORT"          : "Port:",
         "FIELD_HEADER_PRIVATE_KEY"   : "Private key:",
+	"FIELD_HEADER_PUBLIC_KEY"    : "Public key:",
         "FIELD_HEADER_SCROLLBACK"    : "Maximum scrollback size:",
         "FIELD_HEADER_READ_ONLY"     : "Read-only:",
         "FIELD_HEADER_RECORDING_WRITE_EXISTING" : "@:APP.FIELD_HEADER_RECORDING_WRITE_EXISTING",