core: watch SIGCHLD more closely to track processes of units with no reliable cgroup empty notifier

When a process dies that we can associate with a specific unit, start
watching all other processes of that unit, so that we can associate
those processes with the unit too.

Also, for service units start doing this as soon as we get the first
SIGCHLD for either control or main process, so that we can follow the
processes of the service from one to the other, as long as process that
remain are processes of the ones we watched that died and got reassigned
to us as parent.

Similar, for scope units start doing this as soon as the scope
controller abandons the unit, and thus management entirely reverts to
systemd. To abandon a unit introduce a new Abandon() scope unit method
call.

src/core/scope.h

@@ -29,6 +29,7 @@ typedef struct Scope Scope;
 typedef enum ScopeState {
         SCOPE_DEAD,
         SCOPE_RUNNING,
+        SCOPE_ABANDONED,
         SCOPE_STOP_SIGTERM,
         SCOPE_STOP_SIGKILL,
         SCOPE_FAILED,
@@ -57,13 +58,13 @@ struct Scope {
 
         char *controller;
 
-        Set *pids;
-
         sd_event_source *timer_event_source;
 };
 
 extern const UnitVTable scope_vtable;
 
+int scope_abandon(Scope *s);
+
 const char* scope_state_to_string(ScopeState i) _const_;
 ScopeState scope_state_from_string(const char *s) _pure_;