add external/python/<package> repos

mostly contain third-party python packages.

Bug: 36873359
Test: mma
Merged-In: Ifecedbe945845c30583aec096f44bcb10fe1cae0
Change-Id: I2a35e179a4d9bcfcd013f6fa296b67f6a8a0639b
1 file changed
tree: bf378849d8f2dec1dbc1798f6e6fa91ca963fc40
  1. GLOBAL-PREUPLOAD.cfg
  2. default.xml