service: fix crash on exit

service: fix crash on exit

This commit releases all service cores from their role,
returning them to ROLE_RTE on rte_service_finalize().

This fixes an issue relating to the service cores causing
a race-condition on rte_eal_cleanup(), where the service core
could still be executing while the main thread has already
free-d the service memory, leading to a segfault.

Fixes: da23f0aa87d8 ("service: fix memory leak with new function")
Cc: stable@dpdk.org
Reported-by: David Marchand <david.marchand@redhat.com>
Reported-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
Acked-by: Aaron Conole <aconole@redhat.com>