Makes the Extension loader behavior predictable

When using a cluster of load-balanced Neutron Servers,
the order of extension files being loaded may differ
from one server to another. This is usually harmless,
but it is better to force the list to be loaded in the
same way across the entire cluster, just in case
something funky is going on.

Partial-bug: #1285999

Change-Id: Ib0bfd24fc52b6cd9f90c350d3af496f04a90f50a
Floatingip_status migration not including Embrane's plugin

2eeaf963a447_floatingip_status migration script is not including Embrane's core plugin (thus breaking the tests).

Change-Id: Ic051ba2524db2e1bafea102af34351f6c4088db3
Closes-bug: 1289046
Merge "Floatingip_status migration not including Embrane's plugin"
Merge "Makes the Extension loader behavior predictable"