app/procinfo: add collectd format and host id

app/procinfo: add collectd format and host id

Extended proc-info application to send DPDK port statistics to
STDOUT in the format expected by collectd exec plugin. Added
HOST ID option to identify the host DPDK process is running on
when multiple instance of DPDK are running in parallel. This is
needed for the barometer project in OPNFV.

Signed-off-by: Roman Korynkevych <romanx.korynkevych@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Acked-by: Harry van Haaren <harry.van.haaren@intel.com>