test/nvmf: disable identify_kernel test

This test has been causing intermittent failures for some time:

  nvme_rdma.c: 221:nvme_rdma_get_event: *ERROR*: Expected
  RDMA_CM_EVENT_ESTABLISHED but received RDMA_CM_EVENT_UNREACHABLE (7)
  from CM event channel (status = -110)

Disable it until we find a reliable way to avoid this issue.

Change-Id: Id8f767bfa26a6a14f94cf4f7ff69b3ac0f11d88d
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/410489


Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>