build-unit-test-docker: Add python-jsonschema

This package is used to validate JSON files against a
schema file, which will be useful for a few repositories
to do during tests.

Change-Id: I4e440617ec8d5dc5ba21c40ca51038166a92ef92
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
1 file changed