Pin messaging to use Jack with 1.7 language

There is a bug in the current version of Jack
that causes problems when the default is changed to
1.8. Pinning to 1.7 appears to help.

Bug: 27305482
Bug: 26753820
Change-Id: Ia29bf5cb14c754be4c4b453aa89a9d9c369d9e52
1 file changed