Devstack support for nicira plugin

Bug 1116847

Includes slight refactoring of L3 logic in main lib/quantum as previous
logic treated l3-agent as only way to do L3, whereas NVP has its own L3
support.

Change-Id: Ifd8c6864add5939432b544285cf027e52329dea2
Set state_path to quantum.conf

This change is required to make quantum security groups support of
OVS/LinuxBridge plugins work.

Previously state_path was configured in each agent config files in
Quantum, but it is moved to quantum.conf. This change follows it.

Change-Id: I290dc98878661375cf8a31a53d857433de0e5462
move sysstat earlier (but not too early)

sysstat was starting too late to understand the state of the system
when services didn't start. Move it to earlier.

Change-Id: Iaf8e72c441dbdf943f7f25ea3f0fc568138a178f
Remove duplicate package

Remove duplicate kvm

Change-Id: I2cb367a123f47179b7b64ecfe9b61d2a4247d9ff
Signed-off-by: Chuck Short <chuck.short@canonical.com>
Merge "Set state_path to quantum.conf"
Merge "Remove duplicate package"