treewide: run gofmt -s and enable linter

Change-Id: I90b8ef48c955dccfddc5bbc0a57205b7da844b60
Reviewed-on: https://review.monogon.dev/c/monogon/+/3828
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/osbase/event/etcd/etcd_test.go b/osbase/event/etcd/etcd_test.go
index ee3672f..5effa6e 100644
--- a/osbase/event/etcd/etcd_test.go
+++ b/osbase/event/etcd/etcd_test.go
@@ -79,7 +79,7 @@
 
 // testClient is an etcd connection to the test cluster.
 type testClient struct {
-	client     *clientv3.Client
+	client *clientv3.Client
 }
 
 func newTestClient(t *testing.T) *testClient {
@@ -95,7 +95,7 @@
 	}
 
 	return &testClient{
-		client:     cli,
+		client: cli,
 	}
 }