Bounce network interfaces for correct configuration

Some of the changes we're making require the network interfaces to be
brought down and then up, otherwise they don't take effect.
Support the portmap to rpcbind service name change in RHEL6

The portmap service was renamed to rpcbind in RHEL6, so handle this
name conditionally, based on the RHEL version being configured.
Correct a mistake made when converting dev to test/stage

One of the major changes made in 2014 was to disambiguate the use of
the term "dev", by renaming the state to "test" and the path to
"/efs/stage".  This changes fixes a mistake that use test when it
should have used stage, since it's refering to the pathname, not the
release state.
New script: efs_virtual_template

This new script simplifies template creation by primarily automating
the installation of all the optional software needed to make the
template useful for repeated invocation of efs_virtual_machine