RDS: IB: Make use of ARPOP_REQUEST instead of ARPOP_REPLY in bonding code

RDS: IB: Make use of ARPOP_REQUEST instead of ARPOP_REPLY in bonding code

Even though IPv4 ARP RFC allows for using either REQUEST or REPLY
for grat. arp, upstream code from 3.14 onwards have moved on to
use only REQUEST.

Relevant commit:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=56022a8fdd874c56bb61d8c82559e43044d1aa06

RDS active bonding gratuitous arp code needs to adopt to this change
to take advantage of the neighbor updates on UEK4. The current code
makes use  ARPOP_REPLY which needs to be changed to ARPOP_REQUEST.

Orabug: 23094704

Tested-by: Michael Nowak <michael.nowak@oracle.com>
Tested-by: Rose Wang <rose.wang@oracle.com>
Tested-by: Rafael Alejandro Peralez <rafael.peralez@oracle.com>
Acked-by: Mukesh Kacker <mukesh.kacker@oracle.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Reported-by: Mukesh Kacker <mukesh.kacker@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>