Paul Bourke b82111d589 Pick up proxy buildargs from environment
We currently support any buildarg via --build-args. This patch picks up
the default supported proxy buildargs if set in the user's environment,
to allow for more transparent proxy support.

The --build-args will take precendence.

DocImpact
Implements blueprint: better-proxy-support

Change-Id: I084e5d1cc8f9993d65167878f9983ad58a68e86e
2016-01-18 11:53:25 +00:00
..
2016-01-18 11:42:00 +00:00
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