elog-gen.py: Support subdirs

Add ability for elog-gen.py to find yaml files under subdirectories
so that yaml files found in Error/Callout/ and Error/IIC/ for
example can be found by the caller just passing the Error/ directory.

Change-Id: I91dcd523d2a75deea6266a3ea6885b88cd788206
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
2 files changed