ts dump downloads stale and current systems - need an option to download just current systems

[starnold-redhat]

When using the cloud, it is possible to create a lot of stale systems in c.r.h.c. It would be very useful to have an option to only dump the current systems, as this would save a lot of time i the download, and also make the hcs-collector more efficient.

In one of my customers, they have 36k systems in total, but only 12k are current. So this feature would make a significant improvement in performance.

Proposed command line would be
ts dump_current

[waldirio]

Hello @starnold-redhat

Tested and all the information are in the PR.

It's working as expected.

Thank you!
Waldirio