wait until salt-masterless commands are finished

[subbarao]

current implementation doesn't wait until the salt download, install, apply commands are finished.
So current version is not working due to this. also piped output from this command to stdout.

[subbarao]

[subbarao]

example terraform resource definition with digital ocean
https://gist.github.com/subbarao/a226b4671f235690a3b1444b9749cbc4

[marco-m]

Hello, any news? We currently cannot use our extensive salt masterless configuration with Terraform due to #16678, and this PR should fix it :-)

[subbarao]

@apparentlymart current masterless provisioning is not working. what do we need to do get this merged to master.

[subbarao]

#16142 is partial fix. this pull request waits for all calls to complete.

[gapotts]

I can validate this pull request fixes the issue on GCP. I will be testing it as well shortly on AWS and will update once I have verified it there as well. JFYI.

[apparentlymart]

Hi @subbarao! Sorry for the delay here. Things get a bit hectic around release time so we're a bit behind.

[ghost]

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