Title: #2270: Fix render validation items on keypress event at login form
There are many no needed render callings which are performed
on each "keypress" event at login form. It is enough to update
validation items on "CapsLock" state change.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/2270/head:pr2270
git checkout pr2270