fix WARN  org.apache.struts2.interceptor.CookieInterceptor CommonsLogger:warn - Cookie name [control-pluginControl] does not match accepted cookie names pattern [[a-zA-Z0-9\.\]\[_'\s]+]. ie replace - (dash) with _ (underscore).

git-svn-id: https://svn.apache.org/repos/asf/roller/trunk@1585671 13f79535-47bb-0310-9956-ffa450edef68