Test installed rpm packages

[nirs]

Building rpms in centos-8 container in current master is broken, the scripts
are created with the wrong shebang:

# head -1 /usr/bin/ovirt-*
==> /usr/bin/ovirt-imageio <==
#!/usr/bin/python3.9 -s

==> /usr/bin/ovirt-imageioctl <==
#!/usr/bin/python3.9 -s

==> /usr/bin/ovirt-img <==
#!/usr/bin/python3.9 -s

This is wrong, since the scripts are installed by ovirt-imageio-daemon
and ovirt-imageio-client which uses python3.6.

If we install all the rpms

# ls dist/*.x86_64.rpm
dist/ovirt-imageio-client-2.4.9-0.202303141820.git88ec2f0.el8.x86_64.rpm
dist/ovirt-imageio-common-2.4.9-0.202303141820.git88ec2f0.el8.x86_64.rpm
dist/ovirt-imageio-common-debuginfo-2.4.9-0.202303141820.git88ec2f0.el8.x86_64.rpm
dist/ovirt-imageio-daemon-2.4.9-0.202303141820.git88ec2f0.el8.x86_64.rpm
dist/ovirt-imageio-debuginfo-2.4.9-0.202303141820.git88ec2f0.el8.x86_64.rpm
dist/ovirt-imageio-debugsource-2.4.9-0.202303141820.git88ec2f0.el8.x86_64.rpm
dist/python39-ovirt-imageio-client-2.4.9-0.202303141820.git88ec2f0.el8.x86_64.rpm
dist/python39-ovirt-imageio-common-2.4.9-0.202303141820.git88ec2f0.el8.x86_64.rpm
dist/python39-ovirt-imageio-common-debuginfo-2.4.9-0.202303141820.git88ec2f0.el8.x86_64.rpm

This issue is hidden, since running ovirt-img
will run python3.9 and load ovirt_imageio package from /usr/lib64/python3.9/site-packages
but if we install only ovirt-imageio-client, ovirt-img will fail
to find the ovirt_imageio package in /usr/lib64/python3.9/site-packages

The issue is fixed by #194 but it should be tested by the test suite.

We need to add these tests:

1. Only platform python

• dnf remove ovirt-imageio-* python39-ovirt-imageio-*
• install ovirt-imageio-client and ovirt-imageio-daemon
• test that ovirt-img -h, ovirt-imageio -h and ovirt-imageioctl -h

2. Only non-platform python

• dnf remove ovirt-imageio-* python39-ovirt-imageio-*
• install pythonXY-ovirt-imageio-client
• test that we can import the ovirt_imageio package using pythonX.Y

  # (cd /tmp && python3.9 -c 'import ovirt_imageio')
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
  ModuleNotFoundError: No module named 'ovirt_imageio'
  

3. Install both platform and non-platform python packages
   • Same tests, to make sure installing both packages does not break anything

These tests should run as part of CI but not locally.