Don't uninstall sr tools on failed teardown

[klmp200]

When SR cleanup fails on linstor and glusterfs tests, a manual cleanup is needed.
Since tests removes software tools needed to interact with those technologies, we have to install them again to cleanup and it's annoying.

This PR ensures that those tools are still installed on the host machine when this scenario happens

[stormi]

A PR title is important. It's our first contact with the change. Here, it looks like the title currently says the contrary of what the PR actually does :)

[klmp200]

A PR title is important. It's our first contact with the change. Here, it looks like the title currently says the contrary of what the PR actually does :)

Indeed, it does, I made a typo writing it ^^'
It was even contradicting the commit messages which is accurate with it's content :)

That's fixed

I'll add a proper description once I'm done with the content of the PR, it's not ready yet :)

[glehmann]

LGTM

I had the same problem with xfsprogs yesterday. Could you also do that for the XFS SRs ?

[glehmann]

LGTM.
For the next PR, you should separate the type annotations and the actual code changes in multiple commits, to ease the review.

[klmp200]

After further testing and full documenting of the manual cleanup, I've discovered other steps that had to be skipped for glusterfs teardown.
Turns out that the underlying volume on each machine isn't managed by the driver and requires some additional manual steps.
Not skipping teardown steps creates a broken SR that can't be removed. This has been fixed :)