[iputils/f17] (7 commits) ...Add cap_net_admin to ping and ping6

[jsynacek]

Summary of changes:

  69f9e16... Ping fixes:   + enable marking packets when the correct cap (*)
  5983ed6... Backport capability handling from master (#870722) and drop
  81c9549... Drop subint patch and make SO_BINDTODEVICE failure fatal
  bbcf59d... Comment capability patch
  c4d6fe9... Clarify ping -I in the manpage
  b0ee407... Update capability patch to correctly fix ping6 as well.
  9b8d88c... Add cap_net_admin to ping and ping6

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