Improve unfinished object requirements bool check

When we need only boolean value for unfinished object requirements then
we don't need to determine the whole list of unfinished objects.

cdist/config.py

@@ -537,7 +537,7 @@ class Config:
         objects_changed = False
 
         for cdist_object in self.object_list():
-            if cdist_object.requirements_unfinished(
+            if cdist_object.has_requirements_unfinished(
                     cdist_object.requirements):
                 """We cannot do anything for this poor object"""
                 continue
@@ -548,7 +548,7 @@ class Config:
                 self.object_prepare(cdist_object)
                 objects_changed = True
 
-            if cdist_object.requirements_unfinished(
+            if cdist_object.has_requirements_unfinished(
                     cdist_object.autorequire):
                 """The previous step created objects we depend on -
                     wait for them
@@ -567,7 +567,8 @@ class Config:
 
         cargo = []
         for cdist_object in self.object_list():
-            if cdist_object.requirements_unfinished(cdist_object.requirements):
+            if cdist_object.has_requirements_unfinished(
+                    cdist_object.requirements):
                 """We cannot do anything for this poor object"""
                 continue
 
@@ -621,12 +622,13 @@ class Config:
 
         del cargo[:]
         for cdist_object in self.object_list():
-            if cdist_object.requirements_unfinished(cdist_object.requirements):
+            if cdist_object.has_requirements_unfinished(
+                    cdist_object.requirements):
                 """We cannot do anything for this poor object"""
                 continue
 
             if cdist_object.state == core.CdistObject.STATE_PREPARED:
-                if cdist_object.requirements_unfinished(
+                if cdist_object.has_requirements_unfinished(
                         cdist_object.autorequire):
                     """The previous step created objects we depend on -
                     wait for them

cdist/core/cdist_object.py

@@ -280,7 +280,7 @@ class CdistObject:
                                '{}: {}').format(self, error))
 
     def requirements_unfinished(self, requirements):
-        """Return state whether requirements are satisfied"""
+        """Return unsatisfied requirements"""
 
         object_list = []
 
@@ -291,3 +291,14 @@ class CdistObject:
                 object_list.append(cdist_object)
 
         return object_list
+
+    def has_requirements_unfinished(self, requirements):
+        """Return whether requirements are satisfied"""
+
+        for requirement in requirements:
+            cdist_object = self.object_from_name(requirement)
+
+            if cdist_object.state != self.STATE_DONE:
+                return True
+
+        return False