move distro2 to os


git-svn-id: http://observium.org/svn/observer/trunk@4255 61d68cd4-352d-0410-923a-c4978735b2b8
switch to os script from distro


git-svn-id: http://observium.org/svn/observer/trunk@4256 61d68cd4-352d-0410-923a-c4978735b2b8