Can't access qualified import in incremental mode

Serialization/deserialization of qualified imports like import c.d seems to broken. Mypy gives a different error when using -i for this program:

import b
b.c.d.f(1)  # "ModuleType" has no attribute "d" (only when using -i)

b.py:

import c.d

c/__init__.py is empty.

c/d.py:

def f() -> None: pass

Add test cases for AST serialization

Fix accessing qualified import in incremental mode

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