webui: Allow grace login limit
There was no support for setting the grace login limit on the WebUI. The
only way to so was only via CLI:
`ipa pwpolicy-mod --gracelimit=2 global_policy`
Thus, the grace login limit must be updated from the policy section and
this will reflect also on the user settings (under the 'Password Policy'
section)
Fixes: https://pagure.io/freeipa/issue/9211
Signed-off-by: Carla Martinez <carlmart@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>