[FAB-3018]return detailed event hub connection error
[FAB-3018]return detailed event hub connection error

suggest we return more detailed connection error message when
connecting with event hub

Change-Id: I0d7c4043f259bf9a8fc300ea755e09647e217285
Signed-off-by: Frank Han <acb99025a17469fd115223a77bf786cfce97fe03@126.com>

warm3snow/fabric-sdk-go,artchainHangzhou/artchain2,x2cn/artchain,artchainHangzhou/artchain2,warm3snow/fabric-sdk-go,artchainHangzhou/artchain2,x2cn/artchain,artchainHangzhou/artchain2,x2cn/artchain,warm3snow/fabric-sdk-go,x2cn/artchain