pkt_gen: update testcenter implementation

pkt_gen: update testcenter implementation

Update testcenter implementation to move settings to
generic settings file and change windows line endings.
JIRA: VSPERF-126
Change-Id: I156005f261bc0df6c3d8009db72ba2d5991c6166

Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Billy O Mahony <billy.o.mahony@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Brian Castelli <brian.castelli@spirent.com>
Reviewed-by: Gene Snider <eugene.snider@huawei.com>