Implement aliasing idea (per --bridge-interfaces) for DHCPv6 as well as for v4
Allow configuration of on-link (L) bit in Router Advertisement prefix option
Implement aliasing idea (per --bridge-interfaces) for solicited Router Advertisements
Implement aliasing for unsolicited router advertisements
Documentation for IPv6 enhancements
Merge remote-tracking branch 'origin/calico_2.72' into ubuntu_2.72