RESTWS-954: Ensures session endpoint returns locale even when user is not logged in

[mherman22]

Description of what I changed

Made sure we have locale details in the json return when a user is not logged. The json below is extracted from the network after dropping an omod file with the changes into a local server to test the changes in this PR.

{
  "authenticated": false,
  "locale": "en",
  "allowedLocales": [
    "en",
    "en-GB",
    "es",
    "fr",
    "he",
    "km",
    "ar"
  ]
}

Issue I worked on

see https://issues.openmrs.org/browse/RESTWS-954

Checklist: I completed these to help reviewers :)

• My IDE is configured to follow the code style of this project.

  No? Unsure? -> configure your IDE, format the code and add the changes with git add . && git commit --amend

• I have added tests to cover my changes. (If you refactored
  existing code that was well tested you do not have to add tests)

  No? -> write tests and add them to this commit git add . && git commit --amend

• I ran mvn clean package right before creating this pull request and
  added all formatting changes to my commit.

  No? -> execute above command

• All new and existing tests passed.

  No? -> figure out why and add the fix to your commit. It is your responsibility to make sure your code works.

• My pull request is based on the latest changes of the master branch.

  No? Unsure? -> execute command git pull --rebase upstream master