go: Fix things staticcheck complains about

Client: go

Staticcheck is the recommended replacement of the frozen and deprecated
official golint linter [1].

Fix the things it complained about (or add lint:ignore directive) in:

- lib/go/thrift
- lib/go/test/tests
- tutorial/go/src
- test/go/src
- compiler generated code

The majority of the fixes are in the following categories:

- Use of deprecated function (mainly the TConfiguration related ones)
- Redundant break in switch cases
- Unused and unexported variables/fields/functions

Also in the same spirit as fb539ae, remove the error return from
NewTSSLSocket as it can never be non-nil.

This change will be cherry-picked into 0.15.0 branch after merged.

[1]: https://groups.google.com/g/golang-nuts/c/rCP70Aq_tBc
diff --git a/test/go/src/common/printing_handler.go b/test/go/src/common/printing_handler.go
index d91dde4..b726373 100644
--- a/test/go/src/common/printing_handler.go
+++ b/test/go/src/common/printing_handler.go
@@ -26,6 +26,7 @@
 	"fmt"
 	"time"
 
+	//lint:ignore ST1001 allow dot import here
 	. "github.com/apache/thrift/test/go/src/gen/thrifttest"
 )
 
@@ -333,6 +334,7 @@
 		e.Message = arg
 		return e
 	case "TException":
+		//lint:ignore ST1005 To be consistent with other language libraries.
 		return errors.New("Just TException")
 	}
 	return