[pkg] Stop running unit tests from skeleton
The test files shipped as part as the skeleton for `cubeweb-ctl newcube` are
not meant to be run as part of our test suite!
Tests: unittest
Depends:
python3-cubicweb,
@builddeps@,
python3-pytest,
python3-crypto, python3-psycopg2,
postgresql, postgresql-plpython,
firefox
Restrictions: allow-stderr, isolation-container