Bootstrapping: use local repo for phase I

[mickeyn]

in phase I we build half-baked toolchain modules that depend on locally installed modules and we remove those after phase II to be built again properly.

now, if we use a remote/shared repo, it means that our temp. packages may be downloaded by someone else while we are building stuff.

I suggest that in phase I we create a local File repo (in a temp dir) and for those packages without storing them in the real repo.