loop waiting for containerd server to respond

Signed-off-by: Mike Brown <brownwm@us.ibm.com>

hack/test-cri.sh

@@ -61,7 +61,16 @@ if [ ! -x "$(command -v containerd)" ]; then
 fi
 sudo pkill containerd
 sudo containerd -l debug &> ${REPORT_DIR}/containerd.log &
-sleep 1 # sleep 1 seconds for containerd to be ready.
+
+# Wait for containerd to be running by using the containerd client ctr to check the version
+# of the containerd server. Wait an increasing amount of time after each of five attempts
+MAX_ATTEMPTS=5
+attempt_num=1
+until sudo ctr version &> /dev/null || (( attempt_num == MAX_ATTEMPTS ))
+do
+    echo "Attempt $attempt_num to connect to containerd failed! Trying again in $attempt_num seconds..."
+    sleep $(( attempt_num++ ))
+done
 
 # Start cri-containerd
 cd ${ROOT}