service: improve checks of coremasks

service: improve checks of coremasks

This commit improves the error checking performed on the
core masks (or lists) of the service cores, in particular
with respect to the data-plane (RTE) cores of DPDK.

With this commit, invalid configurations are detected at
runtime, and warning messages are printed to inform the user.

For example specifying the coremask as 0xf, and the service
coremask as 0xff00 is invalid as not all service-cores are
contained within the coremask. A warning is now printed to
inform the user.

Reported-by: Vipin Varghese <vipin.varghese@intel.com>
Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
Acked-by: Vipin Varghese <vipin.varghese@intel.com>