Wait if no server or root-certificate.pem file

device-steps.sh will wait forever instead of exit. This shows where
something like FDO would fit in.

Signed-off-by: eriknordmark <erik@zededa.com>

pkg/pillar/scripts/device-steps.sh

@@ -447,10 +447,10 @@ if [ ! -s "$DEVICE_CERT_NAME" ]; then
 else
     echo "$(date -Ins -u) Using existing device key pair"
 fi
-if [ ! -s $CONFIGDIR/server ] || [ ! -s $CONFIGDIR/root-certificate.pem ]; then
-    echo "$(date -Ins -u) No server or root-certificate to connect to. Done" | tee /dev/console
-    exit 0
-fi
+while [ ! -s $CONFIGDIR/server ] || [ ! -s $CONFIGDIR/root-certificate.pem ]; do
+    echo "$(date -Ins -u) No server or root-certificate to connect to. Wait for them" | tee /dev/console
+    sleep 10
+done
 
 if [ -c $TPM_DEVICE_PATH ] && ! [ -f $DEVICE_KEY_NAME ]; then
     echo "$(date -Ins -u) device-steps: TPM device, creating additional security certificates"