Change imports so pytype can parse them (#394)

* Change imports so pytype can parse them

relative imports -> absolute
import foo.bar as baz -> equivalent "from foo ..."

* fixup ...

stdlib/2.7/os/__init__.pyi

@@ -4,7 +4,7 @@ from typing import (
     List, Tuple, Union, Sequence, Mapping, IO, Any, Optional, AnyStr, Iterator,
     MutableMapping, NamedTuple
 )
-import os.path as path
+from os import path
 
 error = OSError
 name = ... # type: str

stdlib/2.7/simplejson/__init__.pyi

@@ -5,6 +5,6 @@ def dump(obj: Any, fp: IO[str], *args: Any, **kwds: Any) -> None: ...
 def loads(s: str, **kwds: Any) -> Any: ...
 def load(fp: IO[str]) -> Any: ...
 
-from .scanner import JSONDecodeError
-from .decoder import JSONDecoder
-from .encoder import JSONEncoder, JSONEncoderForHTML
+from simplejson.scanner import JSONDecodeError
+from simplejson.decoder import JSONDecoder
+from simplejson.encoder import JSONEncoder, JSONEncoderForHTML

stdlib/2.7/xml/etree/ElementInclude.pyi

@@ -3,7 +3,7 @@
 # NOTE: This dynamically typed stub was automatically generated by stubgen.
 
 from typing import Union, Optional, Callable
-from .ElementTree import Element
+from xml.etree.ElementTree import Element
 
 XINCLUDE = ... # type: str
 XINCLUDE_INCLUDE = ... # type: str

stdlib/2.7/xml/etree/ElementPath.pyi

@@ -3,7 +3,7 @@
 # NOTE: This dynamically typed stub was automatically generated by stubgen.
 
 from typing import Pattern, Dict, Generator, Tuple, List, Union, TypeVar, Callable, Optional
-from .ElementTree import Element
+from xml.etree.ElementTree import Element
 
 xpath_tokenizer_re = ... # type: Pattern