While here, do some additional cleanup:
1) add -h option to print help and exit
2) parse args before initializing the environment - this
allows "overhead -h" to immediately show a usage message
without having to wait for DPDK to initialize.
Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I1021f9f7f7f2b03e34c0fd40714ce8f3db849cb2
Reviewed-on: https://review.gerrithub.io/374508
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
ced2c57b67