Add setScreenOrientation to BaseUiAutomation class

This allows workloads to be launched in a pre-determined orientation not the orientation of the physical device itself.

Updated the productivity workloads to take advantage of this new facility.

wlauto/workloads/skype/uiauto/src/com/arm/wlauto/uiauto/UiAutomation.java

@@ -62,6 +62,8 @@ public class UiAutomation extends UxPerfUiAutomation {
         outputDir = parameters.getString("output_dir", "/sdcard/wa-working");
         dumpsysEnabled = Boolean.parseBoolean(parameters.getString("dumpsys_enabled"));
 
+        setScreenOrientation(ScreenOrientation.NATURAL);
+
         // Run tests
         handleLoginScreen(loginName, loginPass);
         confirmAccess();
@@ -72,6 +74,8 @@ public class UiAutomation extends UxPerfUiAutomation {
             voiceCallTest(callDuration);
         }
 
+        unsetScreenOrientation();
+
         // Save results
         writeResultsToFile(results, resultsFile);
     }