Added command lat all stats

Added command lat all stats

lat all stats <core_id> <task_id> combines "lat stats" and "lat packets" within one command.
This command returns:
- One line in case the core_task parser fails. In that case the line will start with: "error: invalid syntax"
- One set of lines for each core task:
	- if core/task is invalid, or not running lat mode, the line will contain (start with) "error...". this will be the only line for that core/task.
	- Otherwise the set of lines will be:
		- One line as returned by "lat stats". This line will be
			- One line starting with "error" in case of error, or
			- One line containing lat_min_usec, lat_max_usec, lat_avg_usec, tot_lat_min_usec, tot_lat_max_usec, last_tsc, rte_get_tsc_hz(), lcore_id, task_id
		- The return from lat packets i.e.
			- One line starting with "error" in case of error, or
			- 128 lines - one for each bucket - as returned by "lat packets" command

This command is more useful then lat packets, as it contains the tsc - needed to see whether the sample is new or not.

Change-Id: I04231aa7c5bd2d352ed6f94d40e88d3b411ce744
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>