f5869324e303a136d7ca802769e8966e8eb26d56
So far "no_gc" was set on -.slice and init.scope, to units that are always running, cannot be stopped and never exist in an "inactive" state. Since these units are the only users of this flag, let's remodel it and rename it "perpetual" and let's derive more funcitonality off it. Specifically, refuse enqueing stop jobs for these units, and report that they are "unstoppable" in the CanStop bus property.
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