Fixing typo in development setup script

The message referred to message referring to PGO_OPERATOR_NAME instead of
PGO_OPERATOR_NAMESPACE.

Author: hstefan

deploy/setupnamespaces.sh

@@ -17,7 +17,7 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 if [ -z $PGO_OPERATOR_NAMESPACE ];
 then
-	echo "error: \$PGO_OPERATOR_NAME must be set"
+	echo "error: \$PGO_OPERATOR_NAMESPACE must be set"
 	exit 1
 fi
 
@@ -77,4 +77,4 @@ then
 			$PGOROOT/deploy/$add_ns_script $ns > /dev/null
 		fi
 	done
-fi
+fi