[RFC 1/2] eal: add llc aware functions

[Wathsala Wathawana Vithanage]

> -unsigned int rte_get_next_lcore(unsigned int i, int skip_main, int wrap)
> +#define LCORE_GET_LLC   \
> +		"ls -d /sys/bus/cpu/devices/cpu%u/cache/index[0-9] | sort  -r
> | grep -m1 index[0-9] | awk -F '[x]' '{print $2}' "
> 

This won't work for some SOCs. 
How to ensure the index you got is for an LLC? Some SOCs may only show upper-level caches here, therefore cannot be use blindly without knowing the SOC.
Also, unacceptable to execute a shell script, consider implementing in C.

--wathsala