[metrics-bugs] #22652 [Metrics/CollecTor]: Adapt CollecTor to metrics-lib 1.9.0

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#22652: Adapt CollecTor to metrics-lib 1.9.0
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 Reporter:  iwakeh             |          Owner:  metrics-team
     Type:  enhancement        |         Status:  needs_review
 Priority:  Medium             |      Milestone:  CollecTor 1.2.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by iwakeh):

 It's not just unit test; using descriptor-1.9.0 works (please find
 [https://gitweb.torproject.org/user/iwakeh/collector.git/commit/?h=task-22652&id=85ea07c63e05c04f59bc098c6d2109df6efd0c84
 tiny tweaks] for checkstyle and have only one place in the test for
 tweaking test data).

 But, metrics-lib-2.0.0 needs more changes, because the (not previously
 deprecated) method `List<Descriptor>  parseDescriptors` is gone now.
 How should the following problems be adapted?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22652#comment:13>
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