Not compatible with udisks2

When run on a system with udisks2, UDisksUnitMonitor throws an exception with "The name org.freedesktop.UDisks was not provided by any .service files".

Diagnostic:
ls /etc/dbus-1/system.d | grep UDisks

returns
org.freedesktop.UDisks2.conf, instead of org.freedesktop.UDisks.conf

UDisks2 is not backwards compatible.

Centos 6.* is ok, but not Centos 7.*
Debian up to wheezy is ok (also, install dbus-java-bin)
Gentoo is not ok

In theory it should be possible to run both UDisks and UDisks2 on the same system, but I don't trust this.

[adamretter]

I would suggest detecting the version of UDisks which you should be able to do by querying DBUS and then abstracting the differences away in a trait with two implementations.