To avoid it being created multiple times for multinode setup.
Note: This reverts "Enable neutron to work in a multi node setup"
(commit 88f8558d87) partly and fixes
the issue differently.
The configuration in question uses the new lib/neutron. (not neutron-legacy)
In that case, calling create_neutron_initial_network from stack.sh directly
is a wrong way, as create_neutron_initial_network is sourced by
neutron-legacy. The new neutron code should not rely on the legacy one.
Closes-Bug: #1613069
Change-Id: I868afeb065d80d8ccd57630b90658e330ab94251
07edde1c14