dhcp ipam: fix client id
dhcp ipam: fix client id

First byte of client ID is type, instead of value. See this from
RFC2132:

   Code   Len   Type  Client-Identifier
   +-----+-----+-----+-----+-----+---
   |  61 |  n  |  t1 |  i1 |  i2 | ...
   +-----+-----+-----+-----+-----+---

Signed-off-by: SilverBut <5906cc41f78295534475348e58e64f41bd0fdaad@users.noreply.github.com>

containernetworking/plugins,containernetworking/plugins