[collectd] nginx plugin supporting many instances

[Rafal Bisingier]

Hi

I've ported changes from apache plugin to support many instances into
the nginx plugin. Originally I've made this in 5.1.0 release, but as I
don't use it currently, I backported the changes to 4.10.1 (version
from Debian stable). This version I've tested in production and it
seems to work ok, so I'm sending it here with the hope for inclusion in
collectd sources (as multiple nginx instances on one host are quite
common "in the wild"). 
So once again: attached is a nginx plugin for collectd-4.10.1 (as
found in Debian stable) supporting many instances on on host.

I'm not sending it as a patch, because almost whole file is different,
so the patch file will be even bigger.

Of course this lacks an appropriate patch for collectd.conf manpage.

-- 
Greetings
Rafal Bisingier
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