Streaming mode for camel-splunk consumer

Apache Camel has a splunk connector.  However it has an issue, that it runs out of memory if result set is too large.  I fixed it by adding streaming support. 

Here is the patch for streaming mode:
https://github.com/dmitrimedvedev/camel/commit/7e4b5e9b206c7a969e6012d9afa40ac7024ee515
https://github.com/dmitrimedvedev/camel/commit/f7063f760f5abf867fa2a6bbbd187220c941fa00

Tracked on ASF jira