Python: Fix query tests

Mostly just adding `private import LegacyPointsTo`. Sometimes getting
rid of other imports that are superceded by that module.

Author: tausbn

python/ql/src/Classes/ClassAttributes.qll

@@ -1,5 +1,5 @@
 import python
-private import semmle.python.pointsto.PointsTo
+private import LegacyPointsTo
 
 /** A helper class for UndefinedClassAttribute.ql and MaybeUndefinedClassAttribute.ql */
 class CheckClass extends ClassObject {

python/ql/src/Classes/ConflictingAttributesInBaseClasses.ql

@@ -12,6 +12,7 @@
  */
 
 import python
+private import LegacyPointsTo
 
 predicate does_nothing(PyFunctionObject f) {
   not exists(Stmt s | s.getScope() = f.getFunction() |

python/ql/src/Classes/DefineEqualsWhenAddingAttributes.ql

@@ -13,6 +13,7 @@
 
 import python
 import Equality
+private import LegacyPointsTo
 
 predicate class_stores_to_attribute(ClassValue cls, SelfAttributeStore store, string name) {
   exists(FunctionValue f |

python/ql/src/Classes/InconsistentMRO.ql

@@ -12,6 +12,7 @@
  */
 
 import python
+private import LegacyPointsTo
 
 ClassObject left_base(ClassObject type, ClassObject base) {
   exists(int i | i > 0 and type.getBaseType(i) = base and result = type.getBaseType(i - 1))

python/ql/src/Classes/MaybeUndefinedClassAttribute.ql

@@ -12,6 +12,7 @@
 
 import python
 import ClassAttributes
+private import LegacyPointsTo
 
 predicate guarded_by_other_attribute(SelfAttributeRead a, CheckClass c) {
   c.sometimesDefines(a.getName()) and

python/ql/src/Classes/MutatingDescriptor.ql

@@ -12,6 +12,7 @@
  */
 
 import python
+private import LegacyPointsTo
 
 predicate mutates_descriptor(ClassObject cls, SelfAttributeStore s) {
   cls.isDescriptorType() and

python/ql/src/Classes/OverwritingAttributeInSuperClass.ql

@@ -12,6 +12,7 @@
  */
 
 import python
+private import LegacyPointsTo
 
 class InitCallStmt extends ExprStmt {
   InitCallStmt() {

python/ql/src/Classes/PropertyInOldStyleClass.ql

@@ -11,6 +11,7 @@
  */
 
 import python
+private import LegacyPointsTo
 
 from PropertyObject prop, ClassObject cls
 where cls.declaredAttribute(_) = prop and not cls.failedInference() and not cls.isNewStyle()

python/ql/src/Classes/ShouldBeContextManager.ql

@@ -14,6 +14,7 @@
  */
 
 import python
+private import LegacyPointsTo
 
 from ClassValue c
 where not c.isBuiltin() and not c.isContextManager() and exists(c.declaredAttribute("__del__"))

python/ql/src/Classes/SlotsInOldStyleClass.ql

@@ -12,6 +12,7 @@
  */
 
 import python
+private import LegacyPointsTo
 
 from ClassObject c
 where not c.isNewStyle() and c.declaresAttribute("__slots__") and not c.failedInference()