Use a mock instead of relying on the real module in tests. This fixes
test failures on RHEL-7 (caused by different configuration).
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
Instead of hardcoding /usr/bin/python in shebangs, use /usr/bin/env.
This allows Pungi to work with dependencies installed in virtualenv.
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
Previous test data was insufficient for proper testing.
Test compose runs and depsolving tests require precisely
set NVRs, dependencies, sub-packages, etc.
Using rpmfluff for these would be an overkill, it's better
to create RPMs directly from specs.
