IAM user for cloud controller should not have access to "BOSH_BUCKET"

[zrob]

These lines indicate a user should have access to bosh bucket, we should remove that.

https://github.com/cloudfoundry/docs-deploying-cf/blob/master/common/cc-blobstore-config.html.md.erb#L195
https://github.com/cloudfoundry/docs-deploying-cf/blob/master/common/cc-blobstore-config.html.md.erb#L196

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/154490656

The labels on this github issue will be updated when the story is started.