Public bug reported:

[Impact]

 * When rax-nova-agent is upgraded and python3-novaagent is not, nova-agent 
crashes.
 * On most systems and in most upgrade scenarios the packages are upgraded 
together users can upgrade rax-nova-agent selectively or unattended-upgrades 
can be interrupted between installing the packages thus selective upgrade of 
the packages can occur.
 * The fix is making rax-nova-agent depend on python3-novaagent with the same 
version thus they are always upgraded together.

[Test Case]

 * Set up a system with an older (matching) upstream version, like 2.1.15 of 
rax-nova-agent and python3-novaagent.
 * Selectively upgrade rax-nova-agent.
 * Run the following command and observe it crashing in not fixed versions and 
succeeding in fixed versions:
   # nova-agent -h

[Regression Potential]

 * The fix ties the packages together with a versioned dependency. It an
error is made setting the dependency the packages stop being
installable.

[Other Info]
 
 * -

** Affects: rax-nova-agent (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1806678

Title:
  rax-nova-agent can be upgraded without upgrading python3-novaagent,
  then it crashes

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