service: use id in runstate function

service: use id in runstate function

This commit reworks the API to move from two separate start
and stop functions, to a "runstate" API which allows setting
the runstate. The is_running API is replaced with an function
to query the runstate. The runstate functions take a id value
for service. Unit tests and the eventdev sw pmd are updated.

Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
Acked-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>