vswitchd: skip right number of arguments in dpdk_init()

vswitchd: skip right number of arguments in dpdk_init()

rte_eal_init() returns the number of parsed dpdk arguments to skip.
dpdk_init() should add 1 to that number, because it has already skipped
the "--dpdk" argument itself.

This patch also makes sure the program name is ovs-vswitchd in
rte_eal_init() and proctitle_init().

Signed-off-by: Daniele Di Proietto <ddiproietto@vmware.com>
Signed-off-by: Ryan Wilson <wryan@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>