[SAC] [OSGeo] #1684: Reorganize trac instances location

[OSGeo]

#1684: Reorganize trac instances location
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 Reporter:  strk           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:
Component:  Systems Admin  |   Keywords:  trac, apache
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 In order to clearly separate app data from statically served files it will
 be useful to have 2 directories under /var/www/trac, one named "instance"
 with all the instances and one named "htdocs" or "html" with the static
 files.

 Until recently /var/www/trac was the DocumentRoot for trac.osgeo.org and
 this opened up access to a lot of not-intended-for-public-eyes files.

 Now the DocumentRoot for static files was moved (by myself) to
 /osgeo/trac/htdocs, while /var/www/trac remained for the instances.

 I hadn't moved the instances because I was concerned about the backup
 procedure, which (I've been told from Martin) uses trac-admin and
 references instances via "/var/www/trac/<instancename>"

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/1684>
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