[#1918] Dedicated pam and AIX tests.


Problem description
===================

This branch add AIX and PAM/LDAP slave for compat.

Changes description
===================

The ubuntu-1004-x64 machine was renamed to ubuntu-ldap and is not dedicated for PAM/LDAP tests.

We no longer support Ubuntu 10.04 so will not run separate test for this OS. 12.04 x64  should be enough to cover Ubuntu. In case we will have customers on 10.04 and there are specific problems on 10.04 we will add a dedicated slave.

The AIX 5.3 slave from RO Lan was stopped and started on UK Lan on what I hope is a more powerfull machine.

Wiki page updated: https://trac.chevah.com:10443/wiki/Infrastructure/Services/ContinuousIntegration

For now only compat/emprical repos will run on AIX. I will come back with a dedicated review for the server repo on AIX.


How to try and test the changes
===============================

reviewers @alibotean @dumol 

This is just to let you know about the changes.

Thanks!