bugtool: tar files from base directory
bugtool: tar files from base directory

This commits fixes the creation of the tar file by compressing all files
included in the base directory instead of using the uppermost directory.

Signed-off-by: André Martins <bc9800b9d52a24cce72a73dd528afed53f10e5fc@cilium.io>

tklauser/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,scanf/cilium,tgraf/cilium,eloycoto/cilium,cilium-team/cilium,cilium/cilium,scanf/cilium,eloycoto/cilium,scanf/cilium,eloycoto/cilium,tgraf/cilium,tklauser/cilium,cilium-team/cilium,cilium/cilium,scanf/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,scanf/cilium,tgraf/cilium,michi-covalent/cilium,eloycoto/cilium,michi-covalent/cilium,scanf/cilium,michi-covalent/cilium,tklauser/cilium,eloycoto/cilium,scanf/cilium,tgraf/cilium,eloycoto/cilium,eloycoto/cilium,cilium/cilium,tklauser/cilium