I have no idea why Fedora isn't upstreaming this (or I know why?).
Anyways, attached to this bug is a patch that implements systemd support in libkworkspace.
Do whatever you want with it.
Created attachment 347626 [details, diff]
add systemd support to libkworkspace
Will be shipped with 4.11. Can be tested by using kde-live.
*** This bug has been marked as a duplicate of bug 451954 ***