[tor-bugs] #20380 [Metrics/CollecTor]: Expand INSTALL.md to a more complete operator's guide

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#20380: Expand INSTALL.md to a more complete operator's guide
-------------------------------+---------------------------------
 Reporter:  karsten            |          Owner:
     Type:  enhancement        |         Status:  needs_review
 Priority:  Medium             |      Milestone:  CollecTor 1.1.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
-------------------------------+---------------------------------

Comment (by iwakeh):

 Please also add some note about the following to the 'common issues'
 section.

 {{{
 ERROR org.torproject.descriptor.index.DescriptorIndexCollector Cannot
 fetch remote file: 2016-10-18-17-05-00-server-descriptors
 java.io.FileNotFoundException: https://collector.torproject.org/recent
 /relay-descriptors/server-descriptors/2016-10-18-17-05-00-server-
 descriptors
 }}}

 (cf. #20430 comment:2)

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Ticket URL: <https://troodi.torproject.org/projects/tor/ticket/20380#comment:17>
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