PLATFORM-517 Add Elasticsearch/Kibana interface to Python commons

JIRA case: https://wikia-inc.atlassian.net/browse/PLATFORM-517

In order to complete https://wikia-inc.atlassian.net/browse/PLATFORM-309 myself and @macbre decided to abstract the Elasticsearch/Kibana related logic out of https://github.com/Wikia/cheetah and add it to Wikia's Python commons for future reuse.

@Wikia/platform-team - second pair of eyes, please. :-)
minor: we've started to use the [`str.format()`](https://docs.python.org/2/library/stdtypes.html#str.format) way of formatting strings instead of the sprintf style. Per the documentation this is preferred way going forward.