The entity type ‘Microsoft.AspNet.Identity.EntityFramework.IdentityUserLogin’ requires a key to be defined

by

Basically the keys of Identity tables are mapped in OnModelCreating method of IdentityDbContext and if this method is not called, you will end up getting the error that you got. This method is not called if you derive from IdentityDbContext and provide your own definition of OnModelCreating as you did in your code. With this setup you have to explicitly call the OnModelCreating method of IdentityDbContext using base.OnModelCreating statement.
This answer also discusses the option I posted here

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