add oracle template (From: Dwight Engen)

add oracle template  (From: Dwight Engen)

This is a new template to create containers based on Oracle Linux. A version
such as 5.8, 6.3, or 6.latest can be specified with -R in which case a rootfs
will be created from rpms downloaded from the Oracle public-yum repo.
Alternatively the path to an existing rootfs of Oracle 5 or 6 may be given to
the template with the -t option.

The architecture of the downloaded rpms installed in the container can be
specified with the -a template option.

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>