[Merge] ubuntu-dev-tools:ubuntutools-misc into ubuntu-dev-tools:master

[Stefano Rivera]

Stefano Rivera has proposed merging ubuntu-dev-tools:ubuntutools-misc into ubuntu-dev-tools:master.

Commit message:
ubuntutools.misc: Replace Popen() calls with check_output()

Fixes a crash in pbuilder-dist

Requested reviews:
  Ubuntu Development Team (ubuntu-dev)

For more details, see:
https://code.launchpad.net/~ubuntu-dev/ubuntu-dev-tools/+git/ubuntu-dev-tools/+merge/372627

Missed an encoding=utf-8 in the python3 branch.

But really, we can refactor this all and make it a bit better.
-- 
Your team Ubuntu Development Team is requested to review the proposed merge of ubuntu-dev-tools:ubuntutools-misc into ubuntu-dev-tools:master.
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