netifd: update to latest git HEAD (coverity fixes)

netifd: update to latest git HEAD (coverity fixes)

513eb27 system-linux: check ioctl return value in system_vlan()
df1625d system-linux: check ioctl return value in system_if_flags()
209c508 system-linux: fix segfault on alloc failure in system_if_check()
4a8e20e system-linux: fix segfault on error in system_add_ip6_tunnel()
36e4700 handler: fix resource leak on error in netifd_init_script_handlers()
86a0e7c system-linux: remove unnecessary open call in system_if_dump_info()
1e2cf67 system-linux: fix memory leak on error in system_add_vxlan()

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>