assign cisco network profile to multiple tenants

Add the ability to assign cisco network profile to multiple tenants during network
profile creation and network profile update.
The project field in Create Network Profile and Update Network Profile will be changed
from char field to multiple selection checkbox field, and the name will be changed to
projects

Change-Id: I6ef43bad09f82112c941e1954734f7d11caa0fc9
Implements: blueprint cisco-network-profile-multi-tenants-support

Conflicts:
	openstack_dashboard/dashboards/router/nexus1000v/forms.py
	openstack_dashboard/dashboards/router/nexus1000v/views.py
	openstack_dashboard/test/test_data/neutron_data.py