title: Create user with firebase admin sdk that can signIn using email and password
body: <p>I'm using firebase admin SDK on cloud functions to create users using </p>
  
  <pre><code>  admin.auth().createUser({
  email: someEmail,
  password: somePassword,
  })
  </code></pre>
  
  <p>now I want user to signIn using <code>signInWithEmailAndPassword('someEmail', 'somePassword')</code> but I cannot. 
  I get the following error</p>
  
  <pre><code>{code: "auth/user-not-found", message: "There is no user record corresponding to this identifier. The user may have been deleted."}
  </code></pre>