clang-format updates

Run with clang-format-6.0 and update to latest .clang-format
as listed in the docs repository.

Change-Id: I40fb686cc66adf56b2c1b5277ac1c44b64b89349
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/interfaces.hpp b/interfaces.hpp
index 6c7651f..3014398 100644
--- a/interfaces.hpp
+++ b/interfaces.hpp
@@ -27,5 +27,5 @@
     CALLOUT,
     POLICY
 };
-}
-}
+} // namespace logging
+} // namespace ibm