Avoid race with udev during ovs agent startup

After taking down the veth link between the physical bridge and the integration
bridge call udevadm settle to wait for any udev events to be completely
processed by the operating system before recreating the veth pair.

Some distributions (e.g. openSUSE) have udev rules installed by default that
call e.g. ifdown <interface> during the remove event. If that is processed
after the ovs agent already brought up the veth pair again the veth pair's
link will be down after the agent completed startup and networking will be
broken for all VM instances.

Change-Id: I95520ea96a9804c5261a0c994bbca137535cc37c
Closes-Bug: #1218556
Remove deprecated NVP options

In Havana, NVP configuration was simplified;
in the process a few options that existed
in Grizzly or older were deprecated. This
change removes those options from the Icehouse
tree.

Fixes bug #1221840

Change-Id: Id83a339c88ec2477718a350b6ac1678ccba01509
Switch agent report_interval option to float

Being able to set report_interval > 0 and < 1 makes
it easier to consistently reproduce rpc race
conditions.

Change-Id: I4d907159147177e98b043e7e800aea5cf8c23103
Related-Bug: #1224001
Fix downgrade in migration

In 477a4488d3f4_ml2_vxlan_type_driver name of table ml2_vxlan_endpoints to drop
was not correct.

Change-Id: I758c42251b2d5bcc921c50394a1313a1ed4ae106
Imported Translations from Transifex

Change-Id: I1d2bca819b92060265cefe00fe67bbccfb6c84d3
Merge "Switch agent report_interval option to float"
Merge "Avoid race with udev during ovs agent startup"
Merge "Imported Translations from Transifex"
Merge "Fix downgrade in migration"
Merge "Remove deprecated NVP options"