enh: polling emulator status each second up to 120 secs after starting

cicd/stages/test.yml

@@ -41,7 +41,15 @@ test-android:
       else
         echo "Starting emulator";
         /opt/android/emulator/emulator -avd test -no-boot-anim -no-window -no-audio -no-snapshot -accel on & 2>&1 > /dev/null
-        sleep 30
+        counter=0
+        while [[ $(/opt/android/platform-tools/adb devices -l | egrep -Ev '^$|List' | wc -l) -eq 0 ]]; do
+          sleep 1
+          counter=$((counter+1))
+          if [[ $counter -gt 120 ]]; then
+            echo "Emulator didn't start in time. Exiting."
+            exit 1
+          fi
+        done
       fi
     - cd ${QDS_CI_ARTIFACTS_PATH}/android/test || exit 1
     - mkdir -p ${QDS_CI_JOB_TEST_RESULTS_PATH}