RFH: extend standard modulefinder.py to understand lazy_import

[Alexander Belchenko]

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Hi,

there is permanent problem with bzr.exe and dependencies for bzr plugins.
It was discussed recently in another thread about plugins on Windows.

In short: if we don't bundle plugins into py2exe'd distribution,
the library.zip with python libraries could lacks some standard python
modules/libraries required for such plugins. One of my recent patch
move builtin plugins launchpad and multiparent out of library.zip
so they affected by this problem as well. (Especially launchpad
plugin that require xmlrpclib module that not used by bzrlib itself).

I want to gather these dependencies automatically with standard python
modulefinder.py. But I can't because bzrlib and plugins heavily used
lazy_import and therefore modulefinder.py can't find lazy dependencies.

I need some help from Python gurus re extending modulefinder.py
functionality to support our lazy_import mechanics.
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