Remove integration group from chef install
Remove integration group from chef install

Chef 12.10.7 added an integration group to the gemfile that currently
(7 October 2016, chef at 1a0c4c5) includes:

  - chef-provisioning
  - chef-provisioning-aws
  - chef-rewind
  - chef-sugar
  - chefspec
  - halite
  - poise
  - poise-boiler
  - knife-windows
  - foodcritic
  - cucumber
  - oc-chef-pedant

oc-chef-pedant is particularly problematic since it requires a
complete checkout of the chef-server from git, which takes both time
to pull down during the build and takes up roughly 66MB on disk.

Signed-off-by: Steven Danna <9ce5770b3bb4b2a1d59be2d97e34379cd192299f@chef.io>

cdapio/omnibus-software,higanworks/omnibus-software,mattray/omnibus-software,higanworks/omnibus-software,chef/omnibus-software,KiiCorp/omnibus-software,chef/omnibus-software,cdapio/omnibus-software,KiiCorp/omnibus-software,aerobase/omnibus-software,C-B4/omnibus-software,chef/omnibus-software,Altiscale/omnibus-software,chef/omnibus-software,aerobase/omnibus-software,higanworks/omnibus-software,C-B4/omnibus-software,cdapio/omnibus-software,aerobase/omnibus-software,atomic-penguin/omnibus-software,mattray/omnibus-software,aerobase/omnibus-software,KiiCorp/omnibus-software,Altiscale/omnibus-software,atomic-penguin/omnibus-software,KiiCorp/omnibus-software,mattray/omnibus-software,higanworks/omnibus-software,cdapio/omnibus-software,mattray/omnibus-software,atomic-penguin/omnibus-software,cdapio/omnibus-software,Altiscale/omnibus-software,C-B4/omnibus-software,Altiscale/omnibus-software,chef/omnibus-software,chef/omnibus-software,C-B4/omnibus-software,aerobase/omnibus-software,KiiCorp/omnibus-software,mattray/omnibus-software,atomic-penguin/omnibus-software,Altiscale/omnibus-software,atomic-penguin/omnibus-software,C-B4/omnibus-software