PY-1767: auto-add a correct first parameter to a method + tests.

python/testData/editing/firstParamClassmethod.after.py

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+class A(object):
+  @classmethod
+  def foo(cls):

python/testData/editing/firstParamClassmethod.py

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+class A(object):
+  @classmethod
+  def foo<caret>

python/testData/editing/firstParamMetaClass.after.py

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+class A(type):
+  @classmethod
+  def f(cls):

python/testData/editing/firstParamMetaClass.py

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+class A(type):
+  @classmethod
+  def f<caret>

python/testData/editing/firstParamMetaNew.after.py

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+class A(type):
+  def __new__(typ):

python/testData/editing/firstParamMetaNew.py

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+class A(type):
+  def __new__<caret>

python/testData/editing/firstParamMetaSimple.after.py

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+class A(type):
+  def f(cls):

python/testData/editing/firstParamMetaSimple.py

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+class A(type):
+  def f<caret>

python/testData/editing/firstParamSimple.after.py

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+class A(object):
+  def foo(self):

python/testData/editing/firstParamSimple.py

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+class A(object):
+  def foo<caret>

python/testData/editing/firstParamSimpleInit.after.py

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+class A(object):
+  def __init__(self):

python/testData/editing/firstParamSimpleInit.py

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+class A(object):
+  def __init__<caret>

python/testData/editing/firstParamSimpleNew.after.py

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+class A(object):
+  def __new__(cls):

python/testData/editing/firstParamSimpleNew.py

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+class A(object):
+  def __new__<caret>

python/testData/editing/firstParamStaticmethod.after.py

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+class A(object):
+  @staticmethod
+  def foo():

python/testData/editing/firstParamStaticmethod.py

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+class A(object):
+  @staticmethod
+  def foo<caret>