Added template for TC_DSLITE_B4_FRAG_BV_002.
Rename Dhcpv4Msg into DHCPv4Msg (aligned with DCHPv6Msg)
Extracted DHCPv6 definitions to be re-used in multiple sub folders.
And file comment on DSLite ATS
Re-ogranise DNS templates
Check variant in getter functions.
Implemented getter functions.
Added initial auxiliary functions - to be filled. Minor changes.
Add TC_DSLITE_B4_GWA_BV_002
Add comments Reorganise group
Component are now stored in component variables.
