[#1633] Fix delayed creation of unix user.

Problem description
===================

It looks like pwd.getpwnam might also raise KeyError.

```
user = pwd.getpwnam(name_encoded)
KeyError: 'getpwnam(): name not found: m\xc3\xa2\xc8\x9b mi\xc8\x9bi\xc8\x99or'
```


Changes description
===================

Update code to catch KeyError when waiting for account to be created.

Rename method name to be the same format as for group creation method.

An release-notes file was added.

Latest compat version is 0.10.0 ... but we need to merge server ticket #85 before using this version.

This is why the current build is based on 0.9.0... 

Once #85 is merged in master, I will also merge this with compat master and release it based on 0.10.0


How to try and test the changes
===============================

reviewers @alibotean 

This is just to let you know about the change.

Hope this will reduce the number of  random failures.

Thanks!