support multiple version jar generation

[Malinithangavell]

1. To support Jar generation in the specified output directory based on the parameter passed.
2. In Jrugged-examples, spring version has been changed to 4.3.3
3. updated the unit test cases.

To generate the Jar with Spring version 4.3.20 , pass as command line arguments -Dspring.version and specify the output directory "-Dtarget.directory.name". With the inclusion of "maven-jar-plugin" the jar will be generated with version passed as argument inside the output directory. This way help us to achieve multiple jar generation based on the version passed. The compatibility of versions are cross validated.

We can also use systemd service and the maven command line arguments to be passed to ExecStart.

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