Remove format_token method
Remove format_token method

The issue_v2_token path used the format_token method. Since we no
longer have a separate path for v2 and v3 token issuance or
validation we can remove this method. It's not used anywhere.

Change-Id: I6ac3b17cc0e2fba647a800ddab546d194b6d1483

ilay09/keystone,mahak/keystone,rajalokan/keystone,openstack/keystone,openstack/keystone,rajalokan/keystone,ilay09/keystone,ilay09/keystone,mahak/keystone,openstack/keystone,mahak/keystone,rajalokan/keystone