beaker: Update apt repos to use beaker

Change-Id: I6c1b14e89714c04cd95c7632ada231d46fa0bc52
diff --git a/multistrap.conf b/multistrap.conf
index 92a4af7..97492d4 100644
--- a/multistrap.conf
+++ b/multistrap.conf
@@ -9,9 +9,9 @@
 [main]
 packages=MAIN_PACKAGES
 source=https://packages.cloud.google.com/apt
-suite=mendel-animal
+suite=mendel-beaker
 
 [bsp]
 packages=
 source=https://packages.cloud.google.com/apt
-suite=mendel-bsp-enterprise-animal
+suite=mendel-bsp-enterprise-beaker