Fix missing device detection in the unit test script

Change-Id: I154d786dd23868a16f69afffcdde2a9bf92e2adb
diff --git a/common/device-side/test-app/run_tests.sh b/common/device-side/test-app/run_tests.sh
index fa5f553..5640260 100755
--- a/common/device-side/test-app/run_tests.sh
+++ b/common/device-side/test-app/run_tests.sh
@@ -17,7 +17,7 @@
 CTS_DIR=$(dirname ${0})/../../..
 source ${CTS_DIR}/test_defs.sh
 
-if [ `adb devices | wc -l` -lt 2 ]; then
+if [ `adb devices | wc -l` -lt 3 ]; then
     echo "NO DEVICES/EMULATORS AVAILABLE. CONNECT ONE."
     exit 1
 fi