Add support for extended attributes for extension resources

Removed unsed import from quantum/tests/unit/test_extension_extended_attribute.py
Address comments.
Change update_attributes_map definition/behavior

Fixes: bug #1116664
Change-Id: Idc360f5b3b35fb1d40237e1bbce39684508175cf
Adds Brocade Plugin implementation

blueprint brocade-quantum-plugin

This plugin is meant to orchestrate Brocade VCS switches
running NOS, examples of these are:
   1. VDX 67xx series of switches
   2. VDX 87xx series of switches

Change-Id: Ia8c91ba0e70d3dc7fa79e7f0e09f869542846954
Merge "Adds Brocade Plugin implementation"
Merge "Add support for extended attributes for extension resources"