This patch add Python 3 support for IPA. We still need to enable it on
gate to avoid code breaking the support from sneaking in.
Partial-Bug: #1474896
Depends-On: I5a774eaa8d978f4d50faca4dc1b03a87fb194ce2
Change-Id: If47c0797b63d2914b3c47aba62ec5201301b6c33