Add os-net-config to the list of packages we clone

Without this, changes such as Idac59e571a72cc8d5693f811ec0121273b891d0f
can't pass as there's no os-net-config git checkout to apply the change to.

Change-Id: I0b7e81b2b73f90db1debe50d707e77fcf7994774
Merge "Add os-net-config to the list of packages we clone"