These are plugins that are internal to collectd; they are bundled in the
source archive. Without this, many of the collectd plugins advertised on
their homepage don't actually work, so I think we should add this.
This change increases the closure size from 129 MiB to 621 MiB. The size
of the collectd store path itself goes from 2 MiB to 2.9 MiB.
Users wanting a smaller closure size can set some (or all) of the
optional inputs to "null" using ".override".
List of new plugins:
amqp
apache
ascent
bind
curl
curl_json
curl_xml
dbi
dns
iptables
libvirt
lvm
memcachec
modbus
mysql
nginx
notify_desktop
pinba
ping
postgresql
redis
rrdcached
rrdtool
sensors
sigrok
varnish
write_http
write_redis
write_riemann
