[packages/rpm-build-tools] (6 commits) ...no-net: initial script

[atler]

Summary of changes:

  e97f990... builder: add ip to loopback interface in netns (*)
  09c6f96... builder: add ipv6 addr to lo in netns too and bring interfa (*)
  52eaa12... builder: fix ip commands chaining (*)
  7279465... builder: ignore errors from setting ip for lo (*)
  f18ba53... builder: add debug support for setting up lo (*)
  ef4847c... no-net: initial script (*)

(*) This commit already existed in another branch; no separate mail sent