iscsi: Unexpected usage of RTE EAL Launch in load balancing

Before removing the DPDK dependency from the iSCSI connection
load balancing, this should be done.

In spdk_iscsi_conn_allocate_reactor(cpumask)

- if any lcore[i]'s state is FINISHED, the caller calls
  rte_eal_wait_lcore(i). But the purpose of rte_eal_wait_lcore()
  is to check if the slave is in a WAIT state before calling
  rte_eal_remote_launch(). The meaning of this usage is not clear.

- If the state of lcore[i] is WAIT or FINISHED, the reactor does
  not run on the lcore[i]. iSCSI connections consist of not reactor
  but poller. Hence selecting lcore[i] with the state WAIT or
  FINISHED does not look correct.

Change-Id: If8c420f2d16dc44e77f8963f5732faa52e3d829b
Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-on: https://review.gerrithub.io/391332


Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ziye Yang <optimistyzy@gmail.com>