build: print error if BuildKit/non-BuildKit-specific flags are used

[thaJeztah]

depends on #2842 merged
fixes#2680
implements #1427 (comment)

With this patch, the --progress, --secret, --ssh, and --output flags
trigger an error when trying to use without BuildKit enabled;

DOCKER_BUILDKIT=0 docker build --progress=plain .
--progress is only supported with BuildKit enabled. Enable BuildKit with DOCKER_BUILDKIT=1

DOCKER_BUILDKIT=0 docker build --output=foo .
--output is only supported with BuildKit enabled. Enable BuildKit with DOCKER_BUILDKIT=1

Likewise, options that are not supported yet by BuildKit, now trigger an error:

DOCKER_BUILDKIT=1 docker build --memory=500M .
--memory is not supported with BuildKit enabled. Disable BuildKit with DOCKER_BUILDKIT=0

- What I did

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- Description for the changelog

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[thaJeztah]

@tiborvass@tonistiigi@silvin-lubecki PTAL

[thaJeztah]

Pushed a second commit to try integrating it with areFlagsSupported() however, that function is called by isSupported(), which is called by PersistentPreRunE, but I think we override that for build; checking now

[codecov-commenter]

Codecov Report

Merging #2736 into master will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@ Coverage Diff @@## master #2736 +/- ##
==========================================
- Coverage 57.15% 57.13% -0.02% 
==========================================
Files 297 297 Lines 18657 18663 +6 ==========================================
Hits 10663 10663 - Misses 7132 7136 +4 - Partials 862 864 +2 

[thaJeztah]

opened #2737 to remove the pre-run hack

[silvin-lubecki]

LGTM 👍

[thaJeztah]

Squashed the commits, and rebased on top of #2737 (that one needs to be merged first)

[silvin-lubecki]

@thaJeztah this PR needs a rebase 🦁

[thaJeztah]

@tiborvass PTAL

[tonistiigi]

The flags marked with no-buildkit annotation do not change the outcome of the build, with the exception of security-opt maybe. So I'm not in favor of erroring on them. Hiding should be enough to recommend not using them.

[thaJeztah]

Do you think we should print a warning? e.g. if someone expects to have set memory limits, but they are not applied?

[codecov-io]

Codecov Report

Merging #2736 (e2986f4) into master (51a0914) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@ Coverage Diff @@## master #2736 +/- ##
==========================================
- Coverage 57.10% 57.08% -0.02% 
==========================================
Files 297 297 Lines 18635 18641 +6 ==========================================
Hits 10642 10642 - Misses 7134 7138 +4 - Partials 859 861 +2