Enable all BUT fieldalignment govet analyzer

The fieldanalyzer does not yet offer a way (afaik) to disable
the "pointer bytes" diagnostic, so we're still relying on the
deprecated maligned linter for struct field size ordering.

We enable all other anaylzers which are not otherwise explicitly
excluded.

refs GH-611

.golangci.yml

@@ -42,6 +42,8 @@ linters:
 
 linters-settings:
   govet:
+    enable-all: true
+
     #
     # Disable fieldalignment settings until the Go team offers more control over
     # the types of checks provided by the fieldalignment linter or golangci-lint