Solve ordering cycle problem

[rstribrn]

CentOS 8.x doesn't start SSH daemon from time to time with mkzram.service installed.

Using:

• systemd-analyze verify default.target detects ordering cycle problem (journalctl fragment):

systemd[1]: multi-user.target: Found ordering cycle on sshd.service/start systemd[1]: multi-user.target: Found dependency on sysinit.target/start systemd[1]: multi-user.target: Found dependency on swap.target/start systemd[1]: multi-user.target: Found dependency on mkzram.service/start systemd[1]: multi-user.target: Found dependency on multi-user.target/start systemd[1]: multi-user.target: Job sshd.service/start deleted to break ordering cycle s....

=> Solution: Don't depend on default dependencies.