Adding haproxy config for contrail-analytics-api
adding error-limt for openstack backend servers in  haproxy config
Making sure management ip is set in the nova.conf for novnc proxy in case if HA setup.
Fix bug 1357158 - 2298centos-havana build- setup_all failed due to nova.conf missing
Change-Id: I9ac4590eeecaa91dbfdc13adbc106d6d5c559342