Update/remove dependencies

[robbavey]

This commit updates the following dependencies:

Jackson-databind to 2.9.10.4
Netty to 4.1.49.final

Additionally, this commit removes the dependency on tcnative +
boringssl based on the work done by @jsvd in #384, which enables the update of netty dependencies while still allowing logstash->logstash communication via the lumberjack
output plugin. (boringssl removed compatibility with CBC ciphers, which
are still a prerequisite for lumberjack output plugin support at this time)

[robbavey]

In addition to the integration tests, this commit was tested against this script created by @jsvd to exercise this issue where the IdleStateHandler was holding back acknowledgements.

Running this script to completion:

Beats Input 6.0.5:

real	1m3.108s
user	0m10.231s
sys	0m0.539s

6.0.9:

real	0m3.223s
user	0m10.363s
sys	0m0.485s

This commit:

real	0m3.231s
user	0m10.295s
sys	0m0.585s

[jsvd]

LGTM
please bump, squash and 🚢

[robbavey]

@jsvd - one thing to note, this will break on versions of Java 8 without the JCE Unlimited Strength Jurisdiction Policy installed. From Java 1.8.0_162 onwards (released January 2018), the policy was installed by default, but prior to this release, these ciphers are not all present, leading to a plugin failure.

I can update the plugin to be more lenient, and warn on missing ciphers, and only fail when no ciphers are available. WDYT?

[jsvd]

I think it's fine that we detect if jce isn't available (maybe through the maximum cipher lenght which should be 128 w/o jce), we exclude the aes 256 ciphers:

          "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
          "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
          "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384",
          "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384",

[robbavey]

@jsvd I've made the changes and updated the changelog and bumped the version - do you think the version should be a minor or patch update?

[jsvd]

I'd vote on patch as a it's a fix and doesn't introduce any new user facing capability

[robbavey]

Done

[jsvd]

LGTM