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
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"