Provides a simple tool 'build-test-tree' and adds a tox environment
command 'build-tree' which takes as arguments a list of yaml files
separated by spaces of test trees to recreate for the developer to
experiment with different layouts and commands.
This simplifies the creation for development purposes some of the
complex scenarios that need to be tested, to provide a mechanism for
any developer to quickly exercise various git commands directly to
understand the impact before trying to apply such changes to the
existing code.
Example execution:
tox -e build-tree -- git_upstream/tests/commands/import/scenarios/\
import_switch_branches_search_ref_custom_namespace.yaml
Change-Id: I801bc3e05197d1ce41e703876ce6f46a705ad935
f37890bb31