add missing files from setup.py
add missing files from setup.py

Fixes bug 1050045.

Currently, setup.py will not copy l3_agent.ini and rootwrap filters
into directory /etc/quantum. Add copy operation in setup.py for those
config files so that those files will be copied into proper directory.

Change-Id: I7052d6c07ffd4d03cafa93187d8072053ee0a832

openstack/networking-mlnx,moshele/networking-mlnx,moshele/networking-mlnx-master,openstack/networking-mlnx,stackforge/networking-mlnx,stackforge/networking-mlnx