packaging/wrapper: Make executable
Remove some autobuilder builtins, add repoweb as builtin

This is a continuation of deleting the autobuilder/task stuff and
moving to a collection of commandline utilities.
tasks: Remove

Most of these were thin wrappers, which are now moved to builtins.

testbase.js though is significant testing logic, which will gain a new
home somewhere else.
packaging/.gitignore: Update to add docker/ tempdir
Remove vcs.js and snapshot.js

These are both vestiges of the build-from-source continuous.
Remove builtin-console

This was only used by the autobuilder.
builtin: Delete dead method
Rename qa-make-disk => create-vm-disk
prep-cloud-disk: New builtin

This just enables min-cloud-agent for now.
create-vm-disk: Use tmpdir, not /