Update to Go 1.16

[szh]

Fixes build failing due to goconvey dependency change. Depends on cyberark/go-mssqldb#30

Desired Outcome

Jenkins builds of Docker images do NOT fail with errors such as the following:

[2021-10-26T21:50:18.036Z] #21 1.547 package embed: unrecognized import path "embed": import path does not begin with hostname
[2021-10-26T21:50:26.134Z] #21 8.793 package io/fs: unrecognized import path "io/fs": import path does not begin with hostname
[2021-10-26T21:50:32.671Z] #21 ERROR: executor failed running [/bin/sh -c go get -u github.com/jstemmer/go-junit-report &&     go get github.com/smartystreets/goconvey]: exit code: 1

Implemented Changes

• The version of Go used in our Docker containers and specified in go.mod is upgraded from Go v1.15 to Go v1.16.
• go env -w GOFLAGS=-mod=mod is run in containers to fix this module issue in go1.16
• Update K8S packages and run go mod tidy to fix build breaking due to this issue
  • k8s.io/api v0.22.3
  • k8s.io/apiextensions-apiserver v0.22.3
  • k8s.io/apimachinery v0.22.3
  • k8s.io/client-go v0.22.3
• Update arguments to K8S package functions
  • Satisfy new function signatures after K8S package updates.
• Fixes bin/codegen script
  • Updates Dockerfile.codegen to use correct upsteam kubernetes/code-generator repo tag matching K8S packages
  • Fix permission denied deleting temp dirs by deleting within Docker context
• Include autogenerated files after fixing codegen script
• Use go1.16 in GHA macOS runner
• Loosen codeclimate rules for autogenerated code and golang context.TODO() false positives
• Use latest cyberark/go-mssqldb

Connected Issue/Story

Incidentally resolves #1387

Definition of Done

• Jenkins builds run with no errors.

Changelog

• The CHANGELOG has been updated, or
• This PR does not include user-facing changes and doesn't require a
  CHANGELOG update

Test coverage

• This PR includes new unit and integration tests to go with the code
  changes, or
• The changes in this PR do not require tests

Documentation

• Docs (e.g. READMEs) were updated in this PR
• A follow-up issue to update official docs has been filed here: insert issue ID
• This PR does not require updating any documentation

Behavior

• This PR changes product behavior and has been reviewed by a PO, or
• These changes are part of a larger initiative that will be reviewed later, or
• No behavior was changed with this PR

Security

• Security architect has reviewed the changes in this PR,
• These changes are part of a larger initiative with a separate security review, or
• There are no security aspects to these changes

[szh]

I'm changing this PR to a draft until cyberark/go-mssqldb#30 is merged in, because I'll have to update the submodule ref.

[szh]

Builds failing. Appears to be a Red Hat issue.
From Jenkins:

[2021-11-01T15:20:36.580Z] Step 24/37 : FROM registry.access.redhat.com/ubi8/ubi as secretless-broker-redhat

[2021-11-01T15:21:57.956Z] received unexpected HTTP status: 503 Service Unavailable

and Github Actions:

Step 24/37 : FROM registry.access.redhat.com/ubi8/ubi as secretless-broker-redhat
received unexpected HTTP status: 504 Gateway Time-out

[diverdane]

Looks good, thanks for taking care of this!
One comment about including an entry in the CHANGELOG.md.

[szh]

Builds seem to have been broken by go mod tidy in go-mssqldb. Rolling that back in cyberark/go-mssqldb#31

[codeclimate]

Code Climate has analyzed commit 2e520e3 and detected 53 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Style	53

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 54.8% (0.0% change).

View more on Code Climate.

[imheresamir]

Note to merger: Don't squash commits when merging - "Rebase and merge"

[diverdane]

LGTM!!! Thank you so much for taking care of this!