systemd: make enablement of n-m-wait-online.service follow n-m.service

This is the approach used by systemd-networkd.

I don't understand the logic that caused systemd-networkd to make the change -
https://github.com/systemd/systemd/commit/9e49656037717b96c06b1f1507a41550bdb2c795

Instead, I am suggesting it for consistency, and because it seems to me this is the
exact correct behaviour. Because if you enable NetworkManager, and rely on it to
configure your network devices, then network mounts will not start correctly at boot
time unless you also enable NetworkManager-wait-online.service.

Enabling NetworkManager-wait-online.service does not cause unnecessary serialization
of the boot process; it is only pulled in if something else (like a network mount)
pulls in network-online.target.

I am suggesting this in response to reading this user support request [1].

[1] https://unix.stackexchange.com/questions/429604/fstab-not-automatically-mounting-smb-storage

[thaller@redhat.com: reworded commit message]

https://github.com/NetworkManager/NetworkManager/pull/76

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