Refactor to pass errors to watch through config YAML

Add errors to watch for through error YAML file
Add support for checkstop error type

Tested:
Generating dumps for elog, core, checkstop type errors.

Change-Id: Idd00ace2e3d0c472a74ec142e6d150e55e843a6f
Signed-off-by: Marri Devender Rao <devenrao@in.ibm.com>
diff --git a/tools/dreport.d/sample.conf b/tools/dreport.d/sample.conf
index 8a0e24a..45f5e59 100644
--- a/tools/dreport.d/sample.conf
+++ b/tools/dreport.d/sample.conf
@@ -8,3 +8,4 @@
 1: core
 2: user
 3: elog
+4: checkstop