0.17.1: [scylla] enable token aware LB by default, improve the docs (#1507)

* [scylla] token awareness is enabled by default

See
https://docs.datastax.com/en/developer/java-driver/3.10/manual/load_balancing/ :

> If you don’t explicitly configure the policy,
> you get the default, which is a datacenter-aware,
> token-aware policy.

* [scylla] driver: update to 3.10.2-scylla-1
* [scylla] log used consistency level
* [scylla] doc: add latency correction section
* [scylla] doc: dump and merge histograms
* [scylla] doc: don't configure connections manually

https://github.com/scylladb/java-driver/commits/3.10.2-scylla

* [scylla] doc: details to sections 1,2,4,5