Added an attribute to control the ldap logging

[nilroy]

Added an attribute to control the ldap logging

[nilroy]

@pcross616 I just wanted to suppress logging by this attribute. There are two cases where it is logging exception:

1. We login with a user which is stored in realm.properties file
2. We login with a ldap user and then logout.

With debug="false" the first case does not log but the second case still logs error. Any idea?

A sample log for the 2nd scenario (with or without the debug"
2016-02-24 10:57:07.504:WARN:oejpj.JAASLoginService: javax.security.auth.login.LoginException: java.lang.NullPointerException|?at org.eclipse.jetty.plus.jaas.spi.AbstractLoginModule.logout(AbstractLoginModule.java:260)|?at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)|?at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)|?at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)|?at java.lang.reflect.Method.invoke(Method.java:498)|?at javax.security.auth.login.LoginContext.invoke(LoginContext.java:755)|?at javax.security.auth.login.LoginContext.access$000(LoginContext.java:195)|?at javax.security.auth.login.LoginContext$4.run(LoginContext.java:682)|?at javax.security.auth.login.LoginContext$4.run(LoginContext.java:680)|?at java.security.AccessController.doPrivileged(Native Method)|?at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)|?at javax.security.auth.login.LoginContext.logout(LoginContext.java:628)|?at org.eclipse.jetty.plus.jaas.JAASLoginService.logout(JAASLoginService.java:274)|?at org.eclipse.jetty.security.SecurityHandler.logout(SecurityHandler.java:561)|?at org.eclipse.jetty.security.authentication.SessionAuthentication.doLogout(SessionAuthentication.java:103)|?at org.eclipse.jetty.security.authentication.SessionAuthentication.valueUnbound(SessionAuthentication.java:130)|?at org.eclipse.jetty.server.session.AbstractSession.unbindValue(AbstractSession.java:489)|?at org.eclipse.jetty.server.session.AbstractSession.clearAttributes(AbstractSession.java:340)|?at org.eclipse.jetty.server.session.AbstractSession.doInvalidate(AbstractSession.java:307)|?at org.eclipse.jetty.server.session.HashedSession.doInvalidate(HashedSession.java:72)|?at org.eclipse.jetty.server.session.AbstractSession.invalidate(AbstractSession.java:297)|?at org.codehaus.groovy.grails.web.servlet.mvc.GrailsHttpSession.invalidate(GrailsHttpSession.java:180)|?at javax.servlet.http.HttpSession$invalidate$1.call(Unknown Source)|?at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)|?at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)|?at org.codehaus.groovy.runtime.callsite.AbstractCallSite

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