pkg_mgr function looks in chroot, as intended

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Fixing work and build dir paths in spec.

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Move #sanitize into BuilderCommand

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Remove Environment in favor of BuilderCommand

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Add hypervisor and operating system to directory name

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Make system_grub stage safe for CentOS

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Standardize mount command and set PATH explicitly

  * ubuntu has PATH declared in /etc/environment, CentOS does not

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Rename image_install_grub => _grub2

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>