[Pkg-utopia-maintainers] Bug#767002: Bug#767002: Bug#767002: network-manager breaks ptp tun interfaces

[Dan Williams]

After reviewing the logs I think:

cb94fe0a9e985647d0feb3637dabdeab56a650a1
core: don't override external route metrics (bgo #738268)

should fix this issue as well, since it actually doesn't just apply to
route metrics but also to addresses.  The issue was that merging the
generated setting back into the config lost some information which
caused NM to think the existing address/routes were not correct, and NM
overwrote them.