client: fix multi-platform pull test

[dmcgowan]

Remove architecture not included in buysbox image and ensures amd64 is included since it may already exist in the content store. (Using a separate namespace just for this test might be more difficult).

[estesp]

Well, that's exciting:

--- FAIL: TestImagePullAllPlatforms (5.63s)
	testing.go:730: race detected during execution of test

(and not even related to your change)

[codecov-io]

Codecov Report

Merging #2272 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2272   +/-   ##
======================================
  Coverage    41.1%   41.1%           
======================================
  Files          66      66           
  Lines        7768    7768           
======================================
  Hits         3193    3193           
  Misses       4070    4070           
  Partials      505     505

Flag	Coverage Δ
#windows	41.1% <ø> (ø)	⬆️

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[estesp]

How come test failures aren't forcing a travis failure? Fluke?

The command "if [ "$GOOS" = "linux" ]; then sudo PATH=$PATH GOPATH=$GOPATH TESTFLAGS_PARALLEL=1 make integration ; fi" exited with 2.

[dmcgowan]

It looks like the race is something we should fix. Related to the client using the resolver in parallel, which seems to be using a shared cache variable for tokens. Let's get this merged and I will work on a fix for that in the next rc (client change only).

[crosbymichael]

LGTM

[estesp]

LGTM