Refactor of mounting system in craft_parts/overlays/chroot.py
Addition of use_host_sources kwarg in craft_parts/overlays/chroot.py::chroot to optionaly mount the apt configuration and ca certificates of host.
Plumbing of use_host_sources from craft_parts/overlays/chroot.py::chroot to craft_parts/lifecycle_manager.py::LifecycleManager for calling by craft_applications
Features contained in this PR