format-code: Look for clang-format-6.0 as well

Otherwise we break the CI infrastructure. Also, fix up some errors that
v6.0 catches that v5.0 doesn't.

Change-Id: Idcbb102ebfda500f874a3e9f13d8ba2b72b6230d
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/vpnor/test/tmpd.cpp b/vpnor/test/tmpd.cpp
index 723bf56..1aaa1fb 100644
--- a/vpnor/test/tmpd.cpp
+++ b/vpnor/test/tmpd.cpp
@@ -37,6 +37,6 @@
     return len;
 }
 
-} // test
-} // virtual_pnor
-} // openpower
+} // namespace test
+} // namespace virtual_pnor
+} // namespace openpower