anchor.diff:  An Identity can only map to a single User, so logging in as a particular
   identity unambiguously determines the User.
   
  -A User can have multiple Identities mapped to it. Multiple login methods can
  -identify the same User.
  +A User can have multiple Identities mapped to it. This allows multiple login
  +methods to identify the same User.
   
   Sample UserIdentityMapping:
   
  
positive.code: is not specified, OpenShift will perform the following logic for retrieving the
  image:
  
  1. If the image's tag is `latest`, OpenShift will always pull down the image from its registry
  2. If the image's tag is not `latest`, and the image exists on the node, OpenShift will run the existing image
  3. If the image's tag is not `latest`, and the image does not exist on the node, OpenShift will pull down the image from its registry
  
  If the pull policy is set to `PullIfNotPresent`, OpenShift will pull the image
  if it doesn't exist on the node.
  
negative.code: }
  ----
  
  <1> `name` is the user name used when adding roles to a user.
  <2> The values in `identities` are Identity objects that map to this user. May be `null` or empty for users that cannot log in.
  <3> The `fullName` value is an optional display name of user.
  <4> `groups` represent any groups the user belongs to.
  ====
  
  === UserIdentityMapping
  