Common: add InternalFailure to error metadata

elog-gen.py does not handle errors without a metadata file
(see openbmc/openbmc#1469). To work around this, add
InternalFailure to the metadata yaml.

Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
Change-Id: I55caf2970ce37d0bba67ec48d137015de4838e1e
diff --git a/xyz/openbmc_project/Common.metadata.yaml b/xyz/openbmc_project/Common.metadata.yaml
index 1c45f45..669a9b0 100644
--- a/xyz/openbmc_project/Common.metadata.yaml
+++ b/xyz/openbmc_project/Common.metadata.yaml
@@ -8,3 +8,5 @@
       type: string
     - str: "ARGUMENT_VALUE=%s"
       type: string
+- name: InternalFailure
+  level: ERR