fix(ci): remove exception logging when connecting to ws
fix(ci): remove exception logging when connecting to ws

with stack traces for every unittest it has too long output on travis.

and there should be no need for details, there is another log entry when
message can't be delivered.

akintolga/superdesk-core,ioanpocol/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,sivakuna-aap/superdesk-core,superdesk/superdesk-core,plamut/superdesk-core,ioanpocol/superdesk-core,mdhaman/superdesk-core,mdhaman/superdesk-core,nistormihai/superdesk-core,mdhaman/superdesk-core,mugurrus/superdesk-core,nistormihai/superdesk-core,hlmnrmr/superdesk-core,mugurrus/superdesk-core,ioanpocol/superdesk-core,marwoodandrew/superdesk-core,hlmnrmr/superdesk-core,akintolga/superdesk-core,marwoodandrew/superdesk-core,petrjasek/superdesk-core,ancafarcas/superdesk-core,mugurrus/superdesk-core,plamut/superdesk-core,petrjasek/superdesk-core,sivakuna-aap/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core,superdesk/superdesk-core,ancafarcas/superdesk-core