Before this patch if secondary process called start/stop
it would only impact the secondary process, the ethdev on the
primary process was not started.

With this patch, when start/stop is called from secondary,
it calls the primary and does the operation there. The design
is generic, and we can later add queue and other operations
as needed.

Bugzilla ID: 73

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
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