[NOTICE] Binary licensing is now auto-generated

[Chesnay Schepler]

Hello,

I just merged FLINK-14008 to 1.8, 1.9 and 1.10, which means that from 
now on the tricky part of the binary licensing (NOTICE-binary, 
licenses-binary) is automatically generated during the release process.

As such these files have been removed from the root directory of the 
project (thus, you don't have to update these things anymore ;)).

This also means that only builds of flink-dist that were built as part 
of the release process will have these files attached.

I have updated the Licensing guide 
<https://cwiki.apache.org/confluence/display/FLINK/Licensing> accordingly.