install.sh non-root error should go to stderr

The non-root error should go to stderr like the other echo output

Signed-off-by: Steven Hardy <shardy@redhat.com>
Change-Id: I1d9c51c43f9a2db0b50c4c95fc0a0e4505078c51

install.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 if [[ $EUID -ne 0 ]]; then
-    echo "This script must be run as root"
+    echo "This script must be run as root" >&2
     exit 1
 fi