codecov: Ignore specs and ovsdb_mock
codecov: Ignore specs and ovsdb_mock

The specs directory and the ovsdb_mock directory don't impact the
functionality of the project quilt.  Adding them to code coverage is a
tad misleading as a result.  This patch removes them.

tejasmanohar/quilt,tejasmanohar/quilt,stevenlin598/quilt,mmussomele/quilt,ejj/quilt-dev,kayousterhout/quilt,kklin/kelda,kklin/quilt,quilt/quilt,tejasmanohar/quilt,kklin/kelda,quilt/quilt,kklin/quilt,kayousterhout/quilt,kayousterhout/quilt,LuiseV/quilt,kklin/kelda,PenguinToast/quilt,LuiseV/quilt,kelda/kelda,stevenlin598/quilt,kelda/kelda,LuiseV/quilt,PenguinToast/quilt,kklin/quilt,NetSys/quilt,PenguinToast/quilt,kklin/kelda,mmussomele/quilt,mmussomele/quilt,ejj/quilt-dev,PenguinToast/quilt,quilt/quilt,tejasmanohar/quilt,mmussomele/quilt,ejj/quilt-dev,kayousterhout/quilt,mmussomele/quilt,stevenlin598/quilt,quilt/quilt,mmussomele/quilt,ejj/quilt-dev,kelda/kelda,stevenlin598/quilt,LuiseV/quilt,stevenlin598/quilt,NetSys/quilt,kklin/quilt,stevenlin598/quilt,PenguinToast/quilt,NetSys/quilt,NetSys/quilt,kelda/kelda,NetSys/quilt,LuiseV/quilt