Impersonate a user

Number of APIs: 5

1. Test that you login as a user (impersonate) GET {{base_url}}/api/2/users/me

2. Logout from an impersonated user GET {{base_url}}/api/2/idp/logout

3. Issue a One Time Token (OTT) POST {{base_url}}/api/2/idp/ott

4. Logins into system using One-Time Token and get IDP session cookie POST {{base_url}}/api/2/idp/ott/login

5. Logins into system using external login URL GET {{base_url}}/api/2/idp/external-login#ott={{ott}}&targetURI={{base_url}}/mc/