Move the build environment handling so it is done once

Metadata

Project: snapcraft
Number: #1782771
Type: issue
State: open
Author: ~sergiusens
Labels: 18.10-build-vm
Created: 2018-07-20 14:12:13.129224+00:00
Updated: 2018-07-20 14:12:16.317184+00:00
Closed: —

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Issue body

Each lifecycle command (or any other) is creating a BuildEnvironment instance to verify parameters, this should be done once and passed through the click ctx object for proper reuse.

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