This commit cap the network, volume and swift extensions on
Tempest's config option api_extensions.
In 2023.2, new extension in neutron are:
- port-hint-ovs-tx-steering
- enable-default-route-bfd
- enable-default-route-ecmp
- standard-attr-fwaas-v2
- allowed-address-pairs-atomic
- network_ha
- security-groups-rules-belongs-to-default-sg
- port-hardware-offload-type
and no new extensions in swift and cinder.
Change-Id: Ic5a2389083f66940739efd01b703fbae96bd5d24