Added qos tables
Changed the way tag lookup worked in nvp driver
Implemented plugin.create_port: fixed_ip and mac_address

Implemented create_port with fixed_ip attribute
Implemented tests for create_port with fixed_ip attribute
Implemented create_port with mac_address attribute
Test fixes on allocate_mac_address ipam tests
Implemented tests for create_port with mac_address attribute
Merge pull request #63 from jkoelker/qos_aiclib_tag_fix

Qos aiclib tag fix
Merge pull request #61 from asadoughi/create_port

Implemented plugin.create_port: fixed_ip and mac_address
Implements a first cut of network strategies

Implements the basic network strategy driver. The aim of this patch is
to provide a conceptually similar implement of both provider networks
and melange default networks while adding additional flexibility. One of
the other aims of this patch is to attempt to coerce a truer version of
shared networks out of the quantum implementation as it exists today.

Still considered a work in progress.