Reset Pulp Server prior to running Pulp Smash during an upgrade test

[omaciel]

Our upgrade jobs use the following steps:

1. Install $OLDER version of Pulp
2. Populate the server with random content
3. Upgrade the server to $LATEST version of Pulp
4. Perform some post-upgrade tasks
5. Run Pulp Smash test suite

By the time we run the automation, the server will already have some data present which can potentially lead to some false negative results in the automation (such as orphan repos or packages).

What we want to do is make sure that we reset the server prior to running the automation but only after we have performed a post-upgrade test. (see 517)