Use shallow import with VCS

[marip8]

Changes per commit message to reduce overall setup time (and resultant docker image size) when working with large projects.

[marip8]

Any ideas why the ABI check test fails on vcs import --recursive --force --shallow /root/base_ws/src? I don't see anywhere in the vcstool docs that says the recursive and shallow options are mutually exclusive

[mathias-luedtke]

Any ideas why the ABI check test fails

That test checks the ABI against a previous commit and it does not exist in a shallow clone..

[mathias-luedtke]

This might break existing setups (just as it breaks the ABI test).
Not sure, if we should make it an opt-in or opt-out behavior..

VCS_IMPORT_SHALLOW?

It must get set to false, if ABICHECK_MERGE=true