mock_generator enchancements related to logging and flow samples
mock_generator enchancements related to logging and flow samples

Added parameters for controlling logging, syslog, and controlling
number of samples in flow message in mock_generator

Closes-Bug: #1585491
(cherry picked from commit c15ac584ba6d7af82d2658b758ae23806f4677e0)

Conflicts:
	src/vnsw/agent/uve/mock_generator.cc

Change-Id: I4d365e4cde5c8839fe41a4102d6ffe64363945b4

tcpcloud/contrail-controller,tcpcloud/contrail-controller,tcpcloud/contrail-controller,tcpcloud/contrail-controller,tcpcloud/contrail-controller,tcpcloud/contrail-controller