Discovery: fixes for plugins: puppet, ipmi, ssh_aix, ssh_hp_msa, ssh_3par, ssh_onstor, ilo_hp

* minor fix for facts.py (puppet)
* test for handle_facts_disks added (puppet)
* fix for ipmi.py
* fix for ssh_aix
* fix for ssh_hp_msa
* fix for ssh_3par
* fix for ssh_onstor
* fix for ilo_hp

http://ralph.allegrogroup.com/buildbot/builders/unittest-ralph-andrzej-jankowski/builds/93