Fix build errors due to import order.

Parse __init__.py to find the version number instead of loading googleclouddebugger in setup.py. The native dependencies get built as part of the last stage of setup, so it's not safe to import the library anywhere in setup.py.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=113971723

Author: b-daniels

src/setup.py

@@ -14,13 +14,13 @@
 
 """Python Cloud Debugger build and packaging script."""
 
+import ConfigParser
 from glob import glob
 import os
-import ConfigParser
-
-from setuptools import setup, Extension
+import re
 from distutils import sysconfig
-import googleclouddebugger
+from setuptools import Extension
+from setuptools import setup
 
 
 def RemovePrefixes(optlist, bad_prefixes):
@@ -69,6 +69,20 @@ def ReadConfig(section, value, default):
     cvars.get('OPT').split(),
     ['-g', '-O', '-Wstrict-prototypes']))
 
+# Determine the current version of the package. The easiest way would be to
+# import "googleclouddebugger" and read its __version__ attribute.
+# Unfortunately we can't do that because "googleclouddebugger" depends on
+# "cdbg_native" that hasn't been built yet.
+version = None
+with open('googleclouddebugger/__init__.py', 'r') as init_file:
+  version_pattern = re.compile(r"^\s*__version__\s*=\s*'([0-9.]*)'")
+  for line in init_file:
+    match = version_pattern.match(line)
+    if match:
+      version = match.groups()[0]
+print 'clouddebugger module version is {0}'.format(version)
+assert version
+
 cdbg_native_module = Extension(
     'googleclouddebugger.cdbg_native',
     sources=glob('googleclouddebugger/*.cc'),
@@ -87,11 +101,11 @@ def ReadConfig(section, value, default):
     long_description=LONG_DESCRIPTION,
     url='https://github.com/GoogleCloudPlatform/cloud-debug-python',
     author='Google Inc.',
-    version=googleclouddebugger.__version__,
+    version=version,
     install_requires=['google-api-python-client'],
     packages=['googleclouddebugger'],
     ext_modules=[cdbg_native_module],
-    license="Apache License, Version 2.0",
+    license='Apache License, Version 2.0',
     keywords='google cloud debugger',
     classifiers=[
         'Programming Language :: Python :: 2.7',