Inline skb_frag_add_head in 4.3 later kernels.
Inline skb_frag_add_head in 4.3 later kernels.

skb_frag_add_head has been removed from 4.3

Closes-Bug: #1572124
Change-Id: I77c182364841331d47357e3fe32b375b07821e24

codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter