The ddf file is added at the end of the list since it depends on tons of
other RFC and 3GGP TS specs, see for instance TS 29.372 Table 8.2.3.0.
Change-Id: I17f7f025ff31d9ce619cd23bfa5f1af282969dbf
A ddf file for TS 29.273 will be added soon to the list, which depends
on several RFCs. Move RFCs earlier in the list since this is a more
generic file than a 3GPP one.
Change-Id: Idcbdfd97332195af05928c81068f6a4779ac306e
S6b Diameter interface (TS 29.273 section 9) uses the
MIP6-Feature-Vector, which according to TS 29.273 9.2.3.2.3 is defined
in RFC 5447.
Related: OS#6229
Change-Id: I478eff657d876d4ec9a5a1906cab48fbaaaae1b9