Retutn OS family in lower case
Retutn OS family in lower case

Return OS family name like ohai style.

Now only redhat and fedora are returned correctly as lower case.
I will try to fix others later.

electrical/specinfra,RoboticCheese/specinfra,chinthakagodawita/specinfra,skamithi/specinfra,glenux/contrib-specinfra,hfm/specinfra,serverspec/specinfra,miketheman/specinfra,mizzy/specinfra,edolnx/specinfra,gh2k/specinfra,chef-partners/specinfra-cisco,lurdan/specinfra,sorah/specinfra,mactkg/specinfra,sean-horn/specinfra,chorrell/specinfra,bodgit/specinfra,k0kubun/specinfra,minimum2scp/specinfra,elibus/specinfra,r7kamura/specinfra,stefanhorning/specinfra,nurse/specinfra,ihassin/specinfra,higanworks/specinfra,verisign/specinfra,optimizely/specinfra,uroesch/specinfra,winebarrel/specinfra,sergueik/specinfra,seroron/specinfra,pfaffle/specinfra,stoned/specinfra,aibou/specinfra,hideyuki/specinfra,tacahilo/specinfra,thenexus6/specinfra