Make StemcellBuilder#build_stemcell idempotent

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Add support for openstack to stemcell Vagrant VM

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Refactor to enable stemcell chroot testing

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Remove ununsed methods

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Rename for consistency

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Cleanup spec

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
BuilderCommand knows about chroot dir

  * to be used for serverspec testing of stemcell chroot

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
StemcellBuilder exposes stemcell_chroot for testing

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Fix rubocop issue

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Add ci:test_stemcell task

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Add yum package to Stemcell building VM

  * preparation for building CentOS stemcells

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Make stemcell package installer function OS agnostic

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Make the disable function safe for non-Ubuntu OSs

Specifically /usr/sbin/invoke-rc.d does not
exist under Centos 6.4

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>