fix NewCommandTimeout handling for freshly created sessions

lib/appium.js

@@ -16,6 +16,10 @@ import util from 'util';
 class AppiumDriver extends BaseDriver {
   constructor (args) {
     super();
+
+    // the main Appium Driver has no new command timeout
+    this.newCommandTimeoutMs = 0;
+
     this.args = args;
 
     this.sessions = {};
@@ -110,12 +114,17 @@ class AppiumDriver extends BaseDriver {
       .catch(B.CancellationError, () => {})
       .catch((err) => {
         log.warn(`Closing session, cause was '${err.message}'`);
+        log.info(`Removing session ${innerSessionId} from our master session list`);
         delete this.sessions[innerSessionId];
       })
       .done();
 
     log.info(`New ${InnerDriver.name} session created successfully, session ` +
              `${innerSessionId} added to master session list`);
+
+    // set the New Command Timeout for the inner driver
+    d.startNewCommandTimeout();
+
     return [innerSessionId, dCaps];
   }
 
@@ -155,9 +164,6 @@ class AppiumDriver extends BaseDriver {
       return super.executeCommand(cmd, ...args);
     }
 
-    // since we don't call super.executeCommand, we need
-    // to clear the appium driver timeout manually
-    this.clearNewCommandTimeout();
     let sessionId = args[args.length - 1];
     return this.sessions[sessionId].executeCommand(cmd, ...args);
   }