Watchdog example. Added fault coverage in all 3 threads.

Fork of Watchdog_sample_nocoverage by William Marsh

Revision:
4:570955aa1a3d
diff -r 32a940251192 -r 570955aa1a3d mbed-os.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Thu Feb 22 15:57:17 2018 +0000
@@ -0,0 +1,1 @@
+https://github.com/armmbed/mbed-os/#569159b784f70feaa32ce226aaca896fb83452f7