test/nvmf: add -o when creating tcp transports.

Kernel versions 5.0.x do not support the -o option from our target.
Currently, kernel versions 5.1.x and 5.2.x are broken for the tcp
transport in loopback, so in order to test against a stock fedora kernel
that works, we will need to use 5.0.x for at least the next few months
until the distributions start shipping 5.3.x which contains the fix we
need.

Change-Id: I41fc5956dd4b53f03879e0adf2427872cd2337ee
Signed-off-by: Seth Howell <seth.howell@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/461741


Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>