cleanup: avoid comparing errors directly

Go 1.13 contains support for error wrapping. To support wrapping,
fmt.Errorf now has a %w verb for creating wrapped errors, and three
new functions in the errors package ( errors.Unwrap, errors.Is and
errors.As) simplify unwrapping and inspecting wrapped errors.

With this change, If we currently compare errors using ==, we have to
use errors.Is instead. Example:

if err == io.ErrUnexpectedEOF

becomes

if errors.Is(err, io.ErrUnexpectedEOF)

https://tip.golang.org/doc/go1.13#error_wrapping

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

e2e/utils.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/base64"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"regexp"
@@ -177,7 +178,7 @@ func waitForDeploymentComplete(name, ns string, c clientset.Interface, t int) er
 		return false, nil
 	})
 
-	if err == wait.ErrWaitTimeout {
+	if errors.Is(err, wait.ErrWaitTimeout) {
 		err = fmt.Errorf("%s", reason)
 	}
 	if err != nil {