Refactor schema/morphline fetching, add longer timeout

Trying to solve `java.lang.RuntimeException: java.net.ConnectException: Connection timed out`. Not really sure what was the initial timeout of `IOUtils.toString` but most likely too short for our request burst to schema registry. Setting to 15 seconds now and we can increase it later if it occurs again. 

Reindented the code as well as it was messed up.

@ljank 
how about "in millis" instead of potentially getting out of date comment "15 seconds"?