images: add variables for package additions

By default the controller and compute images use IMAGE_INSTALL= to
set their package lists. This doesn't allow a local.conf to add
packages via IMAGE_INSTALL += <FOO>.

To allow package addition, but yet still control the base package list,
there are two variables that can now be used to add packages:

   ${OPENSTACK_COMPUTE_EXTRA_INSTALL}
   ${OPENSTACK_CONTROLLER_EXTRA_INSTALL}

Which variable does what, should be self explanitory.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

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