Updated bb values.yaml to have a global value for image pull policy for all core packages

Package Merge Request

Package Changes

• Updated chart/values.yaml to include a global value for imagePullPolicy for all core packages (imagePullPolicy:{})
• Updated the values.yaml for all the core package template/spec in BB to make sure the global value is passed down to all core packages
• Updated image_pull_policy.md doc to show how to use the new global value for the core packages

For Issue

Closes #897 (closed)

docs/guides/using_bigbang/image_pull_policy.md

@@ -5,7 +5,7 @@ The global image pull policy has been adopted in Big Bang for the core packages
 
 This work is not yet complete for addons, but should allow customers easier control over their global pull policy.
 
-We have also documented the package overrides required in preparation for this change in the table below.
+We have also documented the package overrides required if you want to set a single package/pod with a different pull policy than the global.
 
 # ImagePullPolicy per Package