Merge pull request #2842 from brauner/2019-02-11/fix_licensing

tree-wide: Fix inconsistent license headers

diff --cc src/lxc/cmd/lxc_user_nic.c
Simple merge

diff --cc src/lxc/confile_utils.c
Simple merge

diff --cc src/lxc/confile_utils.h
Simple merge

diff --cc src/lxc/raw_syscalls.c
Simple merge

diff --cc src/lxc/raw_syscalls.h
Simple merge