[metrics-bugs] #19622 [Metrics/metrics-lib]: use java 8 in DescripTor

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#19622: use java 8 in DescripTor
---------------------------------+------------------------------
 Reporter:  iwakeh               |          Owner:  metrics-team
     Type:  enhancement          |         Status:  assigned
 Priority:  Medium               |      Milestone:
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:  #19617               |         Points:
 Reviewer:                       |        Sponsor:
---------------------------------+------------------------------

Comment (by karsten):

 When all code bases depending on metrics-lib have upgraded to Java 8 we
 can partially revert [https://gitweb.torproject.org/metrics-
 lib.git/commit/?id=13a22d9ebef304a37179f65f0f00e3c71c3e2523 13a22d9] (just
 the `build.xml` change).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19622#comment:4>
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