pdmgen: Require uppercase meta keys

journald ignores lowercase metadata keys so require them
to be uppercase.  Abort the config file parse when lowercase
keys are found.

Change-Id: Icffffdc6680b4d305329c3395f8e2fda6210964f
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/src/test/propertygentest.cpp b/src/test/propertygentest.cpp
index cf32191..e5c95c2 100644
--- a/src/test/propertygentest.cpp
+++ b/src/test/propertygentest.cpp
@@ -17,9 +17,9 @@
 #include "propertygentest.hpp"
 const std::array<std::string, 3> expectedMeta =
 {
-    "property1"s,
-    "property2"s,
-    "property3"s,
+    "PROPERTY1"s,
+    "PROPERTY2"s,
+    "PROPERTY3"s,
 };
 
 const std::array<std::string, 4> expectedInterfaces =