Adding sections to login form and allowing schema overriding

Packages/ohif-user/client/components/login/userLogin.html

@@ -5,8 +5,10 @@
             {{#form class='user-login-form form-themed p-a-2' schema=instance.schema api=instance.api hideValidationBox=true}}
                 <h3>Sign In</h3>
                 <hr class="m-h-2">
+                {{>section 'userLoginFieldsBefore'}}
                 {{>inputText labelClass='form-group' key='username'}}
                 {{>inputPassword labelClass='form-group' key='password'}}
+                {{>section 'userLoginFieldsAfter'}}
                 <hr class="m-t-0 m-b-2">
                 {{#button action='login' class='form-control btn btn-primary'}}Enter{{/button}}
             {{/form}}