Update MySQL database schema for DHCPv6 config backend.
This includes 2 MRs: one to align DHCPv4 and DHCPv6 definitions, the second to add missing DHCPv6 stuff, i.e. things added fro DHCPv4 but not yet for DHCPv6.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information