[tor-bugs] #22428 [Metrics/CollecTor]: Add webstats module

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#22428: Add webstats module
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 Reporter:  iwakeh             |          Owner:  iwakeh
     Type:  enhancement        |         Status:  needs_review
 Priority:  High               |      Milestone:  CollecTor 1.4.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:  metrics-2017       |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Changes (by iwakeh):

 * status:  needs_information => needs_review


Comment:

 Please review
 [​https://gitweb.torproject.org/user/iwakeh/collector.git/?h=task-22428-3
 this task branch], which is based on the current master and already uses
 java 8 features.

 The implementation changed quite a bit as it could build on the web server
 log specification (#23243). That's why I didn't continue on the earlier
 branch, because I think the code is easier to review in total here.
 It builds on 2.1.0-dev version of metrics-lib.
 Besides the (j)unit tests I ran system tests for sync and local import
 functionality with the supplied real logs.
 The metrics-lib version needs to be adapted as soon as a release with log
 descriptors is available.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22428#comment:33>
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