Address apk update pause

[Szubie]

Small bugfix to address specific apk update issue.

Running apk update does not close the DataDone channel unlike most other commands, leading to waiting for prompt from user before continuing. To address this use a goroutine to call op.Wait and close a channel to signal completion to select call instead.

[idroz]

This is probably unrelated to this pull request, but my current tests are failing with:

# github.com/bravetools/bravetools/platform [github.com/bravetools/bravetools/platform.test]
./host_api_test.go:110:24: not enough arguments in call to host.Postdeploy
	have (*"github.com/bravetools/bravetools/shared".Bravefile)
	want (context.Context, *"github.com/bravetools/bravetools/shared".Bravefile)

[idroz]

This is probably unrelated to this pull request, but my current tests are failing with:

# github.com/bravetools/bravetools/platform [github.com/bravetools/bravetools/platform.test]
./host_api_test.go:110:24: not enough arguments in call to host.Postdeploy
	have (*"github.com/bravetools/bravetools/shared".Bravefile)
	want (context.Context, *"github.com/bravetools/bravetools/shared".Bravefile)

Addressing this in 7ccbe6a

[idroz]

tests now pass

[Szubie]

Thanks - good fix for the tests. The issue encountered in this PR (apk update freezing) doesn't seem to happen to me on Linux, but it did on Windows, so good to have it fixed.