Update helm to 2.14.2, which helps pass lint on newer patchsets

Update shell scripts to pass newer shellcheck

Change-Id: I19f614368a51c338a01cc1f98f874cf2df4e8b06
diff --git a/seba-in-a-box/Makefile b/seba-in-a-box/Makefile
index f53d845..8965f3d 100644
--- a/seba-in-a-box/Makefile
+++ b/seba-in-a-box/Makefile
@@ -15,8 +15,8 @@
 
 K8S_VERSION     ?= "1.12.7"
 
-HELM_VERSION    ?= "2.12.1"
-HELM_SHA256SUM  ?= "891004bec55431b39515e2cedc4f4a06e93782aa03a4904f2bd742b168160451"
+HELM_VERSION    ?= "2.14.2"
+HELM_SHA256SUM  ?= "9f50e69cf5cfa7268b28686728ad0227507a169e52bf59c99ada872ddd9679f0"
 HELM_PLATFORM   ?= "linux-amd64"
 
 CORDCTL_VERSION    ?= 1.1.2