collectd/collectd — pull request #385 by riton (2013-07-30 15:54:21+00:00)
Title: Add PluginInstanceFormat option to add plugin instance support

This commit adds a ```PluginInstanceFormat``` option that, as ```HostnameFormat``` do, accepts several values within ```uuid``` or ```name```.

This allow a configuration as this

```

[...]
HostnameFormat "hostname"
PluginInstanceFormat "name"
[...]

```

that enable the plugin to create RRD files as ```hypervisor_machine/libvirt-instance-XXXXXX```