Simplify `bst shell` implementation

Jürg Billeterrequested to merge
juerg/shell into master
  • Drop support for bst shell --use-buildtree=ask: Proposal on ML
  • Drop support for bst shell --use-buildtree=try: As per ML discussion
  • Make bst shell --use-buildtree imply --build
  • Use single scheduler run for pulling dependencies and buildtree
  • Deduplicate cache checks and corresponding warning/error messages with and without pulling enabled

This is in preparation of support for remote execution without downloading blobs.

Edited by Jürg Billeter

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