odhcpd: update to git HEAD version (FS#396)

8df4253 ndp: harden netlink event socket error handling
b02f3e6 ndp: close proc file descriptor also during error handling
8a615ad npd: rework IPv6 relay logic (FS#396)
0129f79 config: restore interface defaults when cleaning interface

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