Switch multistrap from beaker to chef

Change-Id: I5678432c8302712d6adfacd01a9c57f2e2e931d5
diff --git a/multistrap.conf b/multistrap.conf
index 21c7d99..c568853 100644
--- a/multistrap.conf
+++ b/multistrap.conf
@@ -9,12 +9,12 @@
 [main]
 packages=MAIN_PACKAGES
 source=https://packages.cloud.google.com/apt
-suite=mendel-beaker
+suite=mendel-chef
 
 [bsp]
 packages=
 source=https://packages.cloud.google.com/apt
-suite=mendel-bsp-enterprise-beaker
+suite=mendel-bsp-enterprise-chef
 
 [coral]
 packages=