Stop OVS from generating misleading add-br errors

Stop OVS from generating misleading add-br errors

Create bridge and set datapath_type in 1 transaction to prevent OVS from
generating misleading error messages which jenkins considers as
build errors.

Update vswitch interface to include optional parameters.

Change-Id: I668f474ea909b284f3726807aab42d52ae2fb504
JIRA: VSPERF-122
Signed-off-by: Dino Simeon Madarang <dino.simeonx.madarang@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Billy O Mahony <billy.o.mahony@intel.com>
Reviewed-by: Gene Snider <eugene.snider@huawei.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Radek Zetik <radekx.zetik@intel.com>