embargo: Generalize tool
embargo only works for the kernel package. We have other packages that
might be embargoed such as gcc or kernel-rt. Generalize embargo so that
it runs for any package.
For example)
embargo 8.3 kernel-rt
embargo 7.9 gcc
The default is still the kernel package ie) 'embargo 8.5' will display
information about the kernel package.
Signed-off-by: Prarit Bhargava prarit@redhat.com