WebUI: Add support for login for AD users

After login, method user-find --whoami was called which cannot be
called for AD users. That method was replaced by ipa whoami command
and sequential command according to result of ipa whoami. AD user
can now be logged in.

AD users have new menu definition which contains only list of IPA
users and profile page of AD user - "User ID Override".

This commit also fixes several places where IPA.whoami object was
used, because its structure was also changed. It now contains two
objects. First one is stored in 'metadata' property and stores
result from ipa whoami (type of object, command which should be
called for showing detailed data about currently logged entity, etc).
The second one is stored in 'data' property which stores result of
_show command for currently logged entity.

https://pagure.io/freeipa/issue/3242

Reviewed-By: Petr Vobornik <pvoborni@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

ipaserver/plugins/internal.py

@@ -625,6 +625,7 @@ class i18n_messages(Command):
                 "anchor_label": _("User to override"),
                 "anchor_tooltip": _("Enter trusted or IPA user login. Note: search doesn't list users from trusted domains."),
                 "anchor_tooltip_ad": _("Enter trusted user login."),
+                "profile": _("Profile"),
             },
             "idoverridegroup": {
                 "anchor_label": _("Group to override"),