Add integration tests

[rchukh]

With more platforms added and currently two different installation suits - there is a need of automated integration tests.

At least following should be tested:

• Service operations - start/restart/stop;
• Service availability - simple wget <kibana.url> and wget <elasticsearch.url> should be enough for now. (and because Kibana is not just static html... maybe as a feature extension we could use phantomjs as a test platform for testing web applications);
  • ES nodes info (often misconfiguration issue with logstash using old embedded es, which kibana does not support )? (http://localhost:8081/elasticsearch/_nodes )
• Java availability/version?

[rchukh]

Additional suite needed with non-default attributes, so that integration tests could check whether the configuration settings are used.