Use Go 1.13 error wrapping

[joelanford]

Now that we've upgraded to Go 1.13, we should find instances in our code base of:

1. errors.Wrap(), errors.Wrapf(), and replace them with fmt.Errorf() with %w.
2. fmt.Errorf() calls that wrap an error, but use %s or %v, and replace them with fmt.Errorf() with %w
3. Any other uses of the github.com/pkg/errors package should be transitioned over to Go's standard library errors package, if possible.

All fmt.Errorf() calls that wrap an error should look like the following:

fmt.Errorf("some context about my error: %w", err)

• %w should be preceded by : (colon space)
• %w should not be in parentheses

[nrchakradhar]

@joelanford I can take a shot at this. This will be my first contribution and hence I may take some time. Please let me know if its fine.

[joelanford]

@nrchakradhar Awesome thanks! We would welcome this contribution!

[nrchakradhar]

@joelanford I hope I have understood the changes to be done. I have written a script that does the change for fmt.ErrorF. I will put some samples here tomorrow. If it looks fine, I will commit the changes. Thanks for providing me an opportunity to contribute.

[nrchakradhar]

@joelanford
Following are some of the sample changes. If its fine, I will submit the changes for all files.
About 69 files with about 180 changes will be modified.

err	other	Changes done
%v	none	operator-sdk\cmd\operator-sdk\printdeps\cmd.go LINE:  47 return fmt.Errorf("print deps failed: %v", err) return fmt.ErrorF("print deps failed: %w", err)'
%v	%v, (%v), %s, %q	operator-sdk\test\test-framework\test\e2e\memcached_test.go LINE:  91 return fmt.Errorf("could not update memcached CR %q: %v", key, err) return fmt.ErrorF("could not update memcached CR %q: %w", key, err)
(%v)	none	operator-sdk\cmd\operator-sdk\add\api.go LINE:  130 return fmt.Errorf("api scaffold failed: (%v)", err) return fmt.ErrorF("api scaffold failed: %w", err)
(%v)	%v, %s, (%v)	operator-sdk\cmd\operator-sdk\add\api.go operator-sdk\cmd\operator-sdk\build\cmd.go LINE:  137 return fmt.Errorf("failed to output build image %s: (%v)", image, err) return fmt.ErrorF("failed to output build image %s: %w", image, err)
%s	none	operator-sdk\internal\scaffold\helm\chart.go LINE:  119 return nil, nil, fmt.Errorf("failed to create helm-charts directory: %s", err) return nil, nil, fmt.ErrorF("failed to create helm-charts directory: %w", err)