tcp_keepalive task breaks deployment

[Ato]

TASK [configure_instances : sysctl] ********************************************************************************************
fatal: [192.168.122.100]: FAILED! => {"changed": false, "msg": "Failed to reload sysctl: net.bridge.bridge-nf-call-iptables = 1\nnet.bridge.bridge-nf-call-ip6tables = 1\nnet.ipv4.tcp_keepalive_time = 15\nnet.ipv4.tcp_keepalive_intvl = 15\nsysctl: cannot stat /proc/sys/tcp_keepalive_probes: No such file or directory\n"}
fatal: [192.168.122.102]: FAILED! => {"changed": false, "msg": "Failed to reload sysctl: net.bridge.bridge-nf-call-iptables = 1\nnet.bridge.bridge-nf-call-ip6tables = 1\nnet.ipv4.tcp_keepalive_time = 15\nnet.ipv4.tcp_keepalive_intvl = 15\nsysctl: cannot stat /proc/sys/tcp_keepalive_probes: No such file or directory\n"}
fatal: [192.168.122.101]: FAILED! => {"changed": false, "msg": "Failed to reload sysctl: net.bridge.bridge-nf-call-iptables = 1\nnet.bridge.bridge-nf-call-ip6tables = 1\nnet.ipv4.tcp_keepalive_time = 15\nnet.ipv4.tcp_keepalive_intvl = 15\nsysctl: cannot stat /proc/sys/tcp_keepalive_probes: No such file or directory\n"}
 to retry, use: --limit @/root/contrail-ansible-deployer/playbooks/configure_instances.retry

[Nagendra Prasath (npchandran)]

Fixed at https://github.com/Juniper/contrail-ansible-deployer/commit/4120174bea86a9216d1f0b229962294a437a301b