Improve monitoring

It seems in case we have a SEVERE messsage in the log, we should restart jvb.

JVB 2020-03-23 10:00:47.978 SEVERE: [491054] org.jitsi.impl.neomedia.RTPConnectorOutputStream.log() Failed to send a packet to target /94.134.101.26:25036:java.io.IOException: No active socket.

JVB 2020-03-23 10:00:48.010 SEVERE: [520607] org.jitsi.videobridge.SctpConnection.log() Error accepting SCTP connection conf_id=21896a19633eabe5,content=data,ch_id=d8893a4be1013776,endp_id=bc0f3677
java.util.concurrent.RejectedExecutionException: shutdown
        at org.jitsi.impl.osgi.framework.AsyncExecutor.submit(AsyncExecutor.java:205)
        at org.jitsi.impl.osgi.framework.AsyncExecutor.execute(AsyncExecutor.java:64)
        at org.jitsi.videobridge.SctpConnection.acceptIncomingSctpConnection(SctpConnection.java:1255)
        at org.jitsi.impl.osgi.framework.AsyncExecutor.runInThread(AsyncExecutor.java:122)
        at org.jitsi.impl.osgi.framework.AsyncExecutor.access$000(AsyncExecutor.java:28)
        at org.jitsi.impl.osgi.framework.AsyncExecutor$1.run(AsyncExecutor.java:231)