[Java]: Update HdrHistogram to 2.1.7.
[Java]: Update HdrHistogram to 2.1.7.

gkamal/Aeron,tbrooks8/Aeron,real-logic/Aeron,EvilMcJerkface/Aeron,oleksiyp/Aeron,RussellWilby/Aeron,gkamal/Aeron,galderz/Aeron,real-logic/Aeron,galderz/Aeron,mikeb01/Aeron,tbrooks8/Aeron,RussellWilby/Aeron,oleksiyp/Aeron,RussellWilby/Aeron,oleksiyp/Aeron,mikeb01/Aeron,galderz/Aeron,EvilMcJerkface/Aeron,EvilMcJerkface/Aeron,galderz/Aeron,EvilMcJerkface/Aeron,tbrooks8/Aeron,gkamal/Aeron,real-logic/Aeron,mikeb01/Aeron,real-logic/Aeron,mikeb01/Aeron