exclude all groups plus new chefstyle group on Chef-15
exclude all groups plus new chefstyle group on Chef-15

the --without argument to bundle install removes the chefstyle gem from
the shipped artifact.

this also applies to the excludes to the merged gemfile lock that we
should be using in testing, but i believe we are still not.

Signed-off-by: Lamont Granquist <0ab8dc438f73addc98d9ad5925ec8f2b97991703@scriptkiddie.org>

higanworks/omnibus-software,aerobase/omnibus-software,chef/omnibus-software,chef/omnibus-software,chef/omnibus-software,aerobase/omnibus-software,higanworks/omnibus-software,mattray/omnibus-software,higanworks/omnibus-software,chef/omnibus-software,chef/omnibus-software,mattray/omnibus-software,higanworks/omnibus-software,mattray/omnibus-software,aerobase/omnibus-software,chef/omnibus-software,mattray/omnibus-software,mattray/omnibus-software,aerobase/omnibus-software,aerobase/omnibus-software