Sync oslo incubator

Sync oslo at c306bc19150fe6e58b088a713c8f45ba4c693496 to help
oslo.messaging transition. It also fixes how the oslo middleware module
is included, and remove the deprecated test module.

Change-Id: I2b44ba24e5a3445db6ffb9c56089ae282f3620b1
Merge "Sync oslo incubator"