Login Page: Add space for inline form errors.

[Ron-Lavi]

In addition to this discussion about adding space for inline form errors or not,

After trying to implement the PF3 LoginPage component,
people really disliked the jumping errors, see: https://community.theforeman.org/t/our-new-login-page/11827/27

So in my opinion this is something worth to be fixed.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.