Remove python images from perapp Makefile

[lukedirtwalker]

They were never used, so we can safely delete them.

Fixes #3339

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This change is 

[worxli]

Reviewed 10 of 10 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @lukedirtwalker)

a discussion (no related file):
You need to update the publish file. Also, as I mentioned, the readme.

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[lukedirtwalker]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @worxli)

a discussion (no related file):

Previously, worxli (Lukas Bischofberger) wrote…

You need to update the publish file. Also, as I mentioned, the readme.

Done.

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[worxli]

Reviewed 2 of 2 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved

[worxli]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @lukedirtwalker)

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docker/perapp/publish, line 9 at r2 (raw file):

echo "Tag: ${1:-}"

go_images="border dispatcher_go sig beacon cert path sciond"

make that images directly

[lukedirtwalker]

Reviewable status: 11 of 13 files reviewed, 1 unresolved discussion (waiting on @worxli)

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docker/perapp/publish, line 9 at r2 (raw file):

Previously, worxli (Lukas Bischofberger) wrote…

make that images directly

Done.

[worxli]

Reviewed 2 of 2 files at r3.
Reviewable status: complete! all files reviewed, all discussions resolved