[dts] [PATCH V1]test_plans/cvl_advanced_rss_gtpu_test_plan:update GTPPDUSessionContainer layer and some steps

[Tu, Lijuan]

> 1. use the scapy layer GTPPDUSessionContainer instead of local layer
> GTP_PDUSession_ExtensionHeader in gtpu test plan.
> 2. fix typo in Subcase: toeplitz/symmetric with same pattern (switched rule
> order)
> 3. modify expected result in Subcase: toeplitz/symmetric with different
> pattern (with/without UL/DL)
> as code changing.
> 
> Signed-off-by: qifu <qi.fu at intel.com>

Applied