API changes for AuthManager
Changes here are:
- action=login is deprecated for use other than bot passwords
- list=users will indicate if a missing user name is creatable.
- Added action=query&meta=authmanagerinfo
- Added action=clientlogin is to be used to log into the main account
- action=createaccount is changed in a non-BC manner
- Added action=linkaccount
- Added action=unlinkaccount
- Added action=changeauthenticationdata
- Added action=removeauthenticationdata
- Added action=resetpassword
Bug: T110276
Bug: T110747
Bug: T110751
Bug: T32788
Bug: T67857
Bug: T28597
Bug: T76103
Change-Id: I244fa9b1e0623247d6d9fa30990411c6df94a496