ansible: obs default haproxy maxconn is 3000.
ansible: obs default haproxy maxconn is 3000.

Signed-off-by: Zhao Chao <abb6a2f7e4fabebf6d227485f53d7acf834f1da2@gmail.com>

huntxu/eayunstack-upgrade,eayunstack/eayunstack-upgrade,huntxu/eayunstack-upgrade,eayunstack/eayunstack-upgrade,huntxu/eayunstack-upgrade,eayunstack/eayunstack-upgrade,huntxu/eayunstack-upgrade,eayunstack/eayunstack-upgrade