This PS replaces deprecared module pkg_resources,
also fixes the schema validation by adding
specific schema draft to choose in order to
prevent the processor to fall back to use the
latest draft that may potentially cause issues.
Also switched to quay.io/airshipit for base ubuntu
image
Change-Id: I687ef267ee3b027e80815e8852c8edcab5b5b727
108a3c1ee4