nfd-master: add DisableAutoPrefix feature gate

[marquiz]

Now that we have support for feature gates deprecate the autoDefaultNs config option of nfd-master and replace it with a new alpha feature gate DisableAutoPrefix (defaults to false). Using a feature gate to handle and communicate these kind of changes, where the default behavior is intended to be changed in a future release, feels much more natural than using random flags/options.

The combined logic of the feature gate and the config option is a logical OR over disabling auto-prefixing. That is, auto-prefixing is disabled if either the feature gate or the config options is used set to disable it:

                         | DisableAutoPrefix (feature gate)
                         | false | true
    -------------------- | --------------------------------
    autoDefaultNs   true |  ON   | OFF
    (config opt)   false |  OFF  | OFF

[marquiz]

/assign @ArangoGutierrez

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: marquiz, TessaIO

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[marquiz]

Unit tests fixed /assign @TessaIO

[marquiz]

Fixes in documentation

[TessaIO]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 184422087d1e37ee1a774d206708040bc9226bdf

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 39.85%. Comparing base (5d9266b) to head (1213454).

Additional details and impacted files

[](https://app.codecov.io/gh/kubernetes-sigs/node-feature-discovery/pull/1707?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubernetes-sigs) ```diff @@ Coverage Diff @@ ## master #1707 +/- ## ======================================= Coverage 39.85% 39.85% ======================================= Files 80 80 Lines 6839 6839 ======================================= Hits 2726 2726 Misses 3859 3859 Partials 254 254 ``` | [Files](https://app.codecov.io/gh/kubernetes-sigs/node-feature-discovery/pull/1707?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubernetes-sigs) | Coverage Δ | | |---|---|---| | [pkg/nfd-master/nfd-master.go](https://app.codecov.io/gh/kubernetes-sigs/node-feature-discovery/pull/1707?src=pr&el=tree&filepath=pkg%2Fnfd-master%2Fnfd-master.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubernetes-sigs#diff-cGtnL25mZC1tYXN0ZXIvbmZkLW1hc3Rlci5nbw==) | `41.01% <0.00%> (ø)` | |

[TessaIO]

/retest