Remove unused imports.

guacamole/src/main/java/net/sourceforge/guacamole/net/basic/crud/connections/Update.java

@@ -18,9 +18,7 @@ package net.sourceforge.guacamole.net.basic.crud.connections;
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-import java.io.IOException;
 import java.util.Enumeration;
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import net.sourceforge.guacamole.GuacamoleException;