Update network api version in defaults.json
Update network api version in defaults.json

neutronclient expects 2.0, not 2 - but we'd not noticed because all
of the consumption of client constructors were bypasing the version
arg for neutron. In a follow-up patch we'll fix that, but the
value in defaults.json is just straight wrong.

Change-Id: I684c4ef063193355c6cf936d4f18576db919762b

dtroyer/python-openstacksdk,stackforge/python-openstacksdk,openstack/os-client-config,openstack/python-openstacksdk,openstack/python-openstacksdk,dtroyer/python-openstacksdk,stackforge/python-openstacksdk,dtroyer/os-client-config