JMX fix allow multiple Norbert servers in same JVM

This adds the same fixe as 793e164d80b821d04c4be0e21d0da198a6a509de
does, but to a few more places which are used when running as a server.

https://linkedin.jira.com/browse/NOR-12
Merge pull request #17 from jhartman/master

Double check locking for atomicCreateIfAbsent
Merge pull request #19 from jhartman/master

Norbert bugfixes for sensei load balancer
Merge pull request #14 from stromnet/master

JMX fix allow multiple Norbert servers in same JVM
Changed the granularity of measuring time intervals to microseconds. Added stats for 90 and 99 percentile.
Merge pull request #20 from abhinigam/master

Changed the granularity at which we measure time in norbert
Merge pull request #21 from jhartman/master

Version 0.6.32
create one way messages feature
fix indentation
change interface for sendRequest back to not take an Option callback
add sendMessage interface to NetworkClient
improve interfaces for sendMessage and add some tests
duplicated all relevant tests from sendRequest for sendMessage
Merge pull request #23 from vikstrous/one_way_message_optional_cb

create one way messages feature
Version 0.6.33