lint: remove dot import (go-common)

Spell out the package explicitly.
This commit is totally textual, and does not change any logic.

The swiss-army knife package may serve a kick-start in early
stage development. But as the codebase growing, we might want
to retire it gradually:

  For simple wrapping functions, just inline it on the call site.
  For larger pice of code, make it an independent package.

cmd/dummy/main.go

@@ -6,7 +6,7 @@ import (
 	"github.com/tendermint/abci/example/dummy"
 	"github.com/tendermint/abci/server"
 	"github.com/tendermint/abci/types"
-	. "github.com/tendermint/go-common"
+	common "github.com/tendermint/go-common"
 )
 
 func main() {
@@ -27,11 +27,11 @@ func main() {
 	// Start the listener
 	srv, err := server.NewServer(*addrPtr, *abciPtr, app)
 	if err != nil {
-		Exit(err.Error())
+		common.Exit(err.Error())
 	}
 
 	// Wait forever
-	TrapSignal(func() {
+	common.TrapSignal(func() {
 		// Cleanup
 		srv.Stop()
 	})