Bug 1274880

This neutron rebase package includes a number of notable enhancements and fixes under version 2015.1.2: * Layer 3 High Availability: - Fixed race condition when starting radvd processes for IPv6 networks - Gratuitous APR updates are now repeated - Fixed HA routers when l2population ML2 driver was used - Fixed a bug where a HA router failed while configuring IPv6 Router Advertisements on its external gateway - It is now possible to configure the underlying physical network for VRRP traffic * L3: - Stale metadata processes are now cleaned up on sync - Prevents attaching an interface to a router if the port does not have an IP address assigned - Gratuitous ARPs are now skipped for IPv6 addresses * Distributed Virtual Routing (DVR): - Service port ARP is now broadcast - Routers are now unscheduled if all remaining ports are not bound to the node * Security Groups: - Fixed ipset cleanup on last security group rule removal - Fixed ipset cleanup if requested set does not exist - IPtables manager is significantly optimized for performance - Fixed interaction with LBaaS ports - More fixes for default security group creation * DHCP: - Fixed a bug where some IPv6 addresses might miss name resolution settings - Scheduler is optimized to guarantee the configured number of agents serving a network - Fixed a bug where tunnels were not created on failover, when using the l2population ML2 driver * ML2 plugin: - Fixed rare race condition where a port and its network were removed in parallel * Open vSwitch (OVS): - Do not use ARP responder for IPv6 addresses * SR-IOV: - Fixed setting admin_state_up for ports * Linux Bridge: - Fixed race condition on bridge cleanup - Tap device MTU is now set according to underlying physical device - Added ARP spoofing protection support (disabled by default) * Port Security: - Fixed late enablement of the extension for existing networks * API: - Allow to unset description for an agent