ONOS takes over 60sec to load Null provider bundle

when starting up ONOS with null provider bundle, it takes more than 60 second before the null provider bundle is loaded. before that, there are repeating exceptions in the debug log:

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2015-03-04 14:40:54,265 | DEBUG | 3]-nio2-thread-9 | KarafJaasAuthenticator | 135 - org.apache.karaf.shell.ssh - 3.0.2 | User authentication failed with null not available to obtain information from user
javax.security.auth.login.LoginException: null not available to obtain information from user
at org.apache.karaf.jaas.modules.properties.PropertiesLoginModule.login(PropertiesLoginModule.java:86)
at org.apache.karaf.jaas.boot.ProxyLoginModule.login(ProxyLoginModule.java:83)[karaf-jaas-boot.jar:]
at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_31]
at java.lang.reflect.Method.invoke(Method.java:483)[:1.8.0_31]
at javax.security.auth.login.LoginContext.invoke(LoginContext.java:755)[:1.8.0_31]
at javax.security.auth.login.LoginContext.access$000(LoginContext.java:195)[:1.8.0_31]
at javax.security.auth.login.LoginContext$4.run(LoginContext.java:682)[:1.8.0_31]
at javax.security.auth.login.LoginContext$4.run(LoginContext.java:680)[:1.8.0_31]
at java.security.AccessController.doPrivileged(Native Method)[:1.8.0_31]
at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)[:1.8.0_31]
at javax.security.auth.login.LoginContext.login(LoginContext.java:587)[:1.8.0_31]
at org.apache.karaf.shell.ssh.KarafJaasAuthenticator.authenticate(KarafJaasAuthenticator.java:97)
at org.apache.sshd.server.auth.UserAuthPublicKey.doAuth(UserAuthPublicKey.java:74)[28:org.apache.sshd.core:0.12.0]
at org.apache.sshd.server.auth.AbstractUserAuth.auth(AbstractUserAuth.java:49)[28:org.apache.sshd.core:0.12.0]
at org.apache.sshd.server.session.ServerUserAuthService.process(ServerUserAuthService.java:145)[28:org.apache.sshd.core:0.12.0]
at org.apache.sshd.common.session.AbstractSession.doHandleMessage(AbstractSession.java:399)[28:org.apache.sshd.core:0.12.0]
at org.apache.sshd.common.session.AbstractSession.handleMessage(AbstractSession.java:295)[28:org.apache.sshd.core:0.12.0]
at org.apache.sshd.common.session.AbstractSession.decode(AbstractSession.java:731)[28:org.apache.sshd.core:0.12.0]
at org.apache.sshd.common.session.AbstractSession.messageReceived(AbstractSession.java:277)[28:org.apache.sshd.core:0.12.0]
at org.apache.sshd.common.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:54)[28:org.apache.sshd.core:0.12.0]
at org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:187)[28:org.apache.sshd.core:0.12.0]
at org.apache.sshd.common.io.nio2.Nio2Session$1.onCompleted(Nio2Session.java:173)[28:org.apache.sshd.core:0.12.0]
at org.apache.sshd.common.io.nio2.Nio2CompletionHandler$1.run(Nio2CompletionHandler.java:32)
at java.security.AccessController.doPrivileged(Native Method)[:1.8.0_31]
at org.apache.sshd.common.io.nio2.Nio2CompletionHandler.completed(Nio2CompletionHandler.java:30)[28:org.apache.sshd.core:0.12.0]
at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126)[:1.8.0_31]
at sun.nio.ch.Invoker$2.run(Invoker.java:218)[:1.8.0_31]
at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)[:1.8.0_31]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_31]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_31]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_31]
2015-03-04 14:40:54,311 | DEBUG | ]-nio2-thread-13 | LoggingCommandSessionListener | 25 - org.apache.karaf.shell.console - 3.0.2 | Executing command: '//
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