Ignore Go src in linter

Makefile

@@ -179,7 +179,7 @@ test_cover:
 
 test_lint:
 	gometalinter.v2 --config=tools/gometalinter.json ./...
-	!(gometalinter.v2 --disable-all --enable='errcheck' --vendor ./... | grep -v "client/")
+	!(gometalinter.v2 --exclude /usr/lib/go/src/ --disable-all --enable='errcheck' --vendor ./... | grep -v "client/")
 	find . -name '*.go' -type f -not -path "./vendor*" -not -path "*.git*" | xargs gofmt -d -s
 	dep status >> /dev/null
 	!(grep -n branch Gopkg.toml)

tools/gometalinter.json

@@ -5,5 +5,6 @@
     "Enable": ["golint", "vet", "ineffassign", "unparam", "unconvert", "misspell"],
     "Deadline": "500s",
     "Vendor": true,
-    "Cyclo": 11
-}
+    "Cyclo": 11,
+    "Exclude": ["/usr/lib/go/src/"]
+}