Features:
+* Add ConditionCredentialExists= or so, that allows conditionalizing services
+ depending on whether a specific system credential is set. Usecase: a service
+ similar to the ssh keygen service that installs any SSH host key supplied via
+ system credentials into /etc/ssh.
+
* drop support for kernels that lack ambient capabilities support (i.e. make
4.3 new baseline). Then drop support for "!!" modifier for ExecStart= which
is only supported for such old kernels