title: working with 2 apps in appium
body: <p>I'm automating testing of mobile app. Now I have a problem with following case: user signs up in mobile app.After that he should recieve email with confirmation code and enter it on confirmation page in mobile app.
   I have 2 appium nodes and 2 drivers, one for mobile app and one for browser.So the problem is the following exception when test "came back" to mobile app for code entering</p>
  
  <p>info: [debug] Responding to client with error: {"status":13,"value":{"message":"
  An unknown server-side error occurred while processing the command.","origValue"
  :"Tried to send command to non-existent Android socket, maybe it's shutting down</p>
  
  <p>How I'm doing test: 1) create acc in mobile app 2) open browser 3) open mail 4) get code 5) close browse r 6) trying to enter code....</p>
  
  <p>Thanks in advance for your help</p>