Prior to this commit, this exposed a virtualenv stats.export.s.o which is no
longer accessible (from munin0 node). Simplifying this to simply export
the rrd file in the munin(0)'s apache venv.
This diff allows to:
- remove the obsolete stats.export.s.o virtualenv from munin0
- expose the export history_counters.json directly from munin0
http://munin.internal.s.o/export/history_counters.json (so far)
- expose the stats.export.s.o virtualenv in pergamon, proxying
requests to munin.internal.s.o/export/ subfolder
There remains work to renew the certificate use for the fqdn
stats.export.s.o but that's not in the scope of the diff.
Related T1544