Fix issue with infinite waiting on socket error

[NumminorihSF]

We faced with this issue on our build system. If 1 browser disconnects by timeout then build job will never be finished.

Error from logs:

{ Error: An unknown server-side error occurred while processing the command.
    at session("delete") - end.js:31:17
    at end() - index.js:37:20
  details: undefined,
  message: 'Session [20431CC8-D2AE-438F-9E29-17C699C70287] was terminated due to TIMEOUT',
  type: 'RuntimeError',
  seleniumStack: 
   { type: 'UnknownError',
     message: 'An unknown server-side error occurred while processing the command.',
     orgStatusMessage: 'Session [20431CC8-D2AE-438F-9E29-17C699C70287] was terminated due to TIMEOUT' } }

This commit fixes this issue.