Flex driver lacks list_instance_uuids, limiting instance scale-out

[James Page]

The flex driver lacks the 'list_instance_uuids' method, which means that the compute manager attempts todo a brute force check by comparing all active instances *in the cloud* with those on the driver.

This means a message gets passed per compute host containing all instances in the cloud - which breaks quite badly at about 12k.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: nova-compute-flex 1:0.1.4-0ubuntu6~cloud0 [origin: Canonical]
ProcVersionSignature: User Name 3.13.0-35.62-generic 3.13.11.6
Uname: Linux 3.13.0-35-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CrashDB:
 {
                "impl": "launchpad",
                "project": "cloud-archive",
                "bug_pattern_url": "http://people.canonical.com/~ubuntu-archive/bugpatterns/bugpatterns.xml",
             }
Date: Mon Oct 27 09:34:29 2014
PackageArchitecture: all
SourcePackage: nova-compute-flex
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.nova.nova.compute.conf: [deleted]
modified.conffile..etc.nova.rootwrap.d.flex.filters: [deleted]

[James Page (james-page)]

https://github.com/zulcss/nova-compute-flex/pull/5