Ensure ip6tables are used only if ipv6 is enabled in kernel

On systems where ipv6 module is not loaded in kernel we need to avoid
usage of ip6tables. This patch reads
/proc/sys/net/ipv6/conf/default/disable_ipv6 file and if ipv6 is
disabled then ip6tables are not used in IptablesManager

Closes-Bug: #1352893

Change-Id: I07e5851aa25eb98b7a97dff86b9850475df85f64
A10 Networks LBaaS v1 Driver

Change-Id: I32438c33ea28031c0d600e2a9266580e52dfbf54
Implements: blueprint a10networks-lbaas-driver
Merge "Ensure ip6tables are used only if ipv6 is enabled in kernel"
Merge "A10 Networks LBaaS v1 Driver"