Dialogic board: make diagnostic messages when SS7 board is down more convinient

[vetss]

We can have a lot messages in the log when no resonse from a dialogic card ( in cases of board restart etc). Let's think may be we can make logging more informative when processing of this case.

2016-04-05 15:06:14,876 ERROR org.mobicents.ss7.hardware.dialogic.DialogicMtp3UserPart Error while reading data from the Dialogic card java.lang.NullPointerException at org.mobicents.ss7.hardware.dialogic.DialogicMtp3UserPart$MtpStreamHandler.run(DialogicMtp3UserPart.java:153) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)