Add missing tests for insertion of docstring stubs on typing enter or space

python/testData/editing/enterDocStringStubInClass.after.py

@@ -0,0 +1,4 @@
+class C:
+  '''
+  <caret>
+  '''

python/testData/editing/enterDocStringStubInClass.py

@@ -0,0 +1,2 @@
+class C:
+  '''<caret>

python/testData/editing/enterDocStringStubInFile.after.py

@@ -0,0 +1,3 @@
+"""
+<caret>
+"""

python/testData/editing/enterDocStringStubInFile.py

@@ -0,0 +1 @@
+"""<caret>

python/testData/editing/spaceDocStringStubInClass.after.py

@@ -0,0 +1,3 @@
+class C:
+  ''' <caret>
+  '''

python/testData/editing/spaceDocStringStubInClass.py

@@ -0,0 +1,2 @@
+class C:
+  '''<caret>

python/testData/editing/spaceDocStringStubInFile.after.py

@@ -0,0 +1,2 @@
+""" <caret>
+"""

python/testData/editing/spaceDocStringStubInFile.py

@@ -0,0 +1 @@
+"""<caret>

python/testData/editing/spaceDocStringStubInFunction.after.py

@@ -0,0 +1,7 @@
+def func(x, y, z):
+    """ 
+    :param x: <caret>
+    :param y: 
+    :param z: 
+    :return: 
+    """

python/testData/editing/spaceDocStringStubInFunction.py

@@ -0,0 +1,2 @@
+def func(x, y, z):
+    """<caret>