[SSO] New user provision flow (#945)

* Initial commit of accept user during set password flow

* changed new org user from accepted to invited // moved another check to token accept function

* Revised some white space // Moved business logic to UserService

* Fixed UserServiceTest

* Removed some white-space

* Removed more white-space

* Final white-space issues

src/Core/Models/Api/Request/Accounts/SetPasswordRequestModel.cs

@@ -19,6 +19,7 @@ namespace Bit.Core.Models.Api.Request.Accounts
         public KdfType Kdf { get; set; }
         [Required]
         public int KdfIterations { get; set; }
+        public string OrgIdentifier { get; set; }
 
         public User ToUser(User existingUser)
         {