[DRAFT] FreeIPA 4.11.0 Release notes

[Antonio Torres]

Hello everyone,

I have created a draft for the IPA 4.11.0 release notes. There are
several commits that were added even if they were part of the IPA 4.10
branch already, so please review so we can remove them accordingly.

https://github.com/freeipa/freeipa.github.io/pull/15