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
