WS-3314: update example runner

Author: Adam Soos

examples/run_all.sh

@@ -1,5 +1,11 @@
 #!/bin/bash
+
+OPTS=""
+if [ -n "$2" ]; then
+    OPTS="-u $2"
+fi
+
 for f in *.py
 do
-    python $f --key $1
+    python $f --key $1 "$OPTS"
 done