packager test should respect builddir_name

- Use 'builddir_name' environment variable to create the output
  path in test_env.py
- This allows running the packager test with different build
  configs because it doesn't use 'out', e.g. it could use 'out_clang'
  for clang builds.

Change-Id: I843343ec8e2d0a64dffbab2fdbd38aead5c97718

packager/app/test/packager_app.py

@@ -19,7 +19,7 @@ class PackagerApp(object):
   """Main integration class for testing the packager binary."""
 
   def __init__(self):
-    self.build_dir = os.path.join(test_env.SRC_DIR, 'out',
+    self.build_dir = os.path.join(test_env.OUT_DIR,
                                   test_env.options.build_type)
     self.binary = os.path.join(self.build_dir, 'packager')
 

packager/app/test/test_env.py

@@ -21,7 +21,7 @@ import sys
 
 # Define static global objects and attributes.
 SRC_DIR = os.path.join(os.path.dirname(os.path.realpath(__file__)), '../../..')
-
+OUT_DIR = os.path.join(SRC_DIR, os.getenv('builddir_name', 'out'))
 
 # Parse arguments and calculate dynamic global objects and attributes.
 parser = argparse.ArgumentParser()