Edit travis config and CHANGES file
simulator manager impl changes to handle SetMonitorServiceCommand This fixes some of the test cases in the integration test test_assign_vm.py when run against a simulator

Signed-off-by: Koushik Das <koushik@apache.org>

Conflicts:
	plugins/hypervisors/simulator/src/com/cloud/agent/manager/SimulatorManagerImpl.java
Release: Fix typo in CHANGES file
Updating pom.xml version numbers for release 4.3.1

Signed-off-by: Sebastien Goasguen <runseb@gmail.com>