Apache HTTP Client 5 implementation

[nck-mlcnv]

This PR implements the Apache HTTP Client 5 for the query executions. This should improve the performance of Iguana. Also changes following things:

• Fix logging configuration
• Cache HTTP requests if queries are cached and also preload them before starting the stresstest (#223)
• HTTP requests send chunked data, if the queries are not cached
• If parseResults is turned off, received response bodies from HTTP requests won't be hashed anymore, to improve performance