Fix the neutron-server start failure issues.

neutron-server was not started as it tries to connect to VncApi before it is up
and fails to start, earlier it had infinite retries to connect to VncApi,
retries are renoved now and so the issue is seen, fixed it by making sure that
contrail-api is up before starting neutron-server

In contrail-icehouse-centos, openstack-neutron package is used from upstream
and it had service_provider set for LOADBALANCER in /usr/share/neutron/neutron-dist.conf
Which caused the neutron-server fail to start with error message "Multiple default
providers for service LOADBALANCER", fixed it by removing the default service_provider
from /usr/share/neutron/neutron-dist.conf

Removing quantum-server-setup.sh from openstack module of the contrail-provisioning,
as it is available in config module and used from config module.

Closes-Bug: #1379640

Change-Id: Ic03f1b11d82d03eead42c134ffb6c3f28272c30e