DM:tools: add acrnlog tool

acrnlog is an SOS userland tool to capture ACRN hypervisor log
to /tmp/acrnog/. Two kinds of logs would be saved:
 - log of current running;
 - log of last running if crashed and logs remaining.

[Usage] acrnlog [-s] [size] [-n] [number]

[Options]
	-h: print this message
	-s: size limitation for each log file, in MB.
	    0 means no limitation.
	-n: how many files you would like to keep on disk

Signed-off-by: Yan, Like <like.yan@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: lyan3

devicemodel/tools/acrnlog/Makefile

@@ -0,0 +1,5 @@
+all:
+	gcc -g acrnlog.c -o acrnlog -lpthread
+
+clean:
+	rm acrnlog