GUACAMOLE-5: Display the username of the user that shares a connection.

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/resources/html/shared-connection.html

@@ -0,0 +1,6 @@
+<meta name="after" content=".caption .activeUserCount">
+
+<!-- The user sharing this connection (if any) -->
+<span class="jdbc-share-tag" ng-show="item.wrappedItem.attributes['jdbc-shared-by']"
+    translate="HOME.INFO_SHARED_BY"
+    translate-values="{USERNAME: item.wrappedItem.attributes['jdbc-shared-by']}"></span>