Suite: performance.

Suite: performance.
Files: Long_IPv4_Intel-X520-DA2.robot, Long_IPv4_Cop_Intel-X520-DA2.robot,
Long_Bridge_Domain_Intel-X520-DA2.robot,
Long_Xconnect_Intel-X520-DA2.robot, Long_Xconnect_Dot1q_Intel-X520-DA2.robot,
Long_IPv6_Intel-X520-DA2.robot, Long_IPv6_Cop_Intel-X520-DA2.robot.
Updated test cases names and test cases documentation.

Conflicts:
	tests/suites/performance/Long_Bridge_Domain_Intel-X520-DA2.robot
	tests/suites/performance/Long_IPv4_Cop_Intel-X520-DA2.robot
	tests/suites/performance/Long_IPv4_Intel-X520-DA2.robot
	tests/suites/performance/Long_IPv6_Cop_Intel-X520-DA2.robot
	tests/suites/performance/Long_IPv6_Intel-X520-DA2.robot
	tests/suites/performance/Long_Xconnect_Dot1q_Intel-X520-DA2.robot
	tests/suites/performance/Long_Xconnect_Intel-X520-DA2.robot

Change-Id: I83262881a4b56512975c8ecc4518ddd2d7ec54b3
Signed-off-by: Maciek Konstantynowicz <mkonstan@cisco.com>
Signed-off-by: Miroslav Miklus <mmiklus@cisco.com>