Adapt cnf-app-mac-operator to operator-sdk v1.33.0

[ramperher]

• Created new cnf-app-mac-operator folder and creating operator-sdk v1.33.0 skeleton with the commands included in README
• Rest of the work was mainly to move missed files to the project, check all files created, adapt Makefile to the new structure, and adapt Golang code to new controller-runtime version used
• webserver is no longer needed for cnf-app-mac-operator controller-manager since it now includes healthz endpoint, so reusing it
• main.go is now under cmd/main.go
• controllers folder is now under internal/controller

[ramperher]

I've launched this job and it has passed the installation of example-cnf, now it's running preflight: https://www.distributed-ci.io/jobs/dbdfc0b4-00e4-4316-b511-c3963935ae6b/jobStates?sort=date. Change can be reviewed in the meantime.

[dcibot]

from change #55:

• SUCCESS https://www.distributed-ci.io/jobs/dbdfc0b4-00e4-4316-b511-c3963935ae6b/jobStates

[ramperher]

Change is working and example-cnf execution and certification looks good, this is ready for review.

Again, similarly to the testpmd-lb-operator, most changes are because of refactoring made by operator-sdk v1.33.0.

[ramperher]

I've just rebased after merging #53, change is ready for review, no more tests are expected to be launched

[ramperher]

PR build check failed, probably because the new images for example-cnf latest versions are still being built in #53, I'll relaunch after some minutes

(upd. fixed)

[ramperher]

Just making a change in the README, no more debug tests are needed for the moment, waiting for reviews.

[ramperher]

I'll wait till tomorrow EOB to receive any more feedback, else I will merge it

[manurodriguez]

LGTM