ci: Update default DPDK and OVS versions

ci: Update default DPDK and OVS versions

VSPERF was updated to use DPDK16.07 and OVS 2.6.90
by default. This change should improve a performance.
It will also solve failures of VSPERF verify and merge
jobs at OPNFV Jenkins, because newer OVS version is
compatible with Linux Kernel 4.4.

JIRA: VSPERF-378

Change-Id: I636dd96facd3f6357f215290eb2382c9cc16150e
Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
Reviewed-by: Bill Michalowski <bmichalo@redhat.com>