NSX-T JAVA Rest API to connect to NSX Manager and get basic information

In this class (NSXTManagerRestAPI.java) , 

- It will connect to NSX-T manager

- Method to get the Logical Switches information

- Method to get the Cluster Configurations.

Note : To use this class add " spring-web-4.0.6.RELEASE.jar , spring-core-4.0.6.RELEASE.jar and commons-logging-1.2.jar " in the build path libraries.