Add list_instance_uuids method

This method is required for optimal instance state reporting,
otherwise the compute manager reverts to doing a brute-force
comparison between all cloud instances and those on the hypervisor.

This breaks past a certain point (12k instances).
Merge pull request #5 from javacruft/wip-instance-uuids

Add list_instance_uuids method
Fix typo

Signed-off-by: Chuck Short <chuck.short@canonical.com>
Clean up hostops

Remove unused function by nova-compute.

Signed-off-by: Chuck Short <chuck.short@canonical.com>
Add instance cleanup

Signed-off-by: Chuck Short <chuck.short@canonical.com>
More typo fixes

Signed-off-by: Chuck Short <chuck.short@canonical.com>
More typo fixes

Signed-off-by: Chuck Short <chuck.short@canonical.com>
Fix traceback

Signed-off-by: Chuck Short <chuck.short@canonical.com>
More clean ups

Signed-off-by: Chuck Short <chuck.short@canonical.com>