SPDK CPU auto detect code has issues

[gbregman]

We have come code in the gateway yo check if the user didn't supply a "--cpumask" or "-m" parameters to SPDK. In this is the case the gateway adds such a parameter using a bit mask based on the number of cores in the machine, but no more than 4. There is a problem with this code:

The code checks for "--cpumask" and "-m" in the SPDK command line list, but the actual values there are slightly different. For example, we might have there "--cpumask=0xF" which is not identical to "--cpumask". The result being that even if the user supplied a CPU mask in the configuration, the gateway still adds a second mask to the command line.