Re-format oslo metadata

Change-Id: Iaed169176f517f2fcae6900af5523b5097ab03ce
Add oslo.messaging and oslo.sphinx

Change-Id: I1d296da6312a2a36141d3b605302eaf03adcb984
Update oslo-core membership

Julien and Ben have joined, Jason has left.

Change-Id: I266c39daf96e332949d740cfadb30e4a29ec2a63