Rename kpm and subcommands

[ChengTian]

kpm -> dnu
kpm bundle -> dnu publish
Cut kpm add (need to notify Tooling team, I think they are using it)

[ChengTian]

Just got suggestion from @davidfowl , we will keep kpm.cmd and add dnu.cmd to have a gradual adoption of dnu.cmd. This can make the transition easier.

[ChengTian]

The first stage is done. We are supporting both kpm and dnu now. This should allow a non-breaking transition.

However, we should force adoption of dnu and remove support of kpm at some point later.

@muratg , moving to next milestone.

[ChengTian]

@muratg , @davidfowl decides that we do this now. Moving back to beta4 and working on it.

[xtianus79]

is there any official documentation to this? where is this coming from?

[ChengTian]

Hi @xtianus79 , you should be able to find official announcements for breaking changes in our https://github.com/aspnet/Announcements repo.
For this specific topic:
aspnet/Announcements#4