[#152615863] Check for bundle executable instead of bundler

Signed-off-by: Iryna Shustava <ishustava@pivotal.io>

Author: sphawley

scripts/test

@@ -3,7 +3,7 @@
 set -u -o pipefail
 
 set +e
-hash bundler > /dev/null 2>&1
+hash bundle > /dev/null 2>&1
 bundler_exists=$?
 set -e