Rax-nova-agent SRU exception

[Balint Reczey]

Dear Release Team,

I'm hereby applying for a new permanent SRU exception [1] for
rax-nova-agent. The rax-nova-agent package is needed on Rackspace
Cloud instances for communicating with the hypervisor thus recurring
updates are needed to adapt to changes in the cloud infrastructure.

Thank you in advance,
Balint

[1] https://wiki.ubuntu.com/rax-nova-agent-Updates

-- 
Balint Reczey
Ubuntu & Debian Developer