Properly shade Netty including its native adapters. Include Guava when shading dependencies.

[raphw]

Fixes #178 and #178.

The system property must be set at the libraries natural entry point which I identified to be GenericContainer. If any of the shaded Netty dependencies is loaded before setting the system property, loading the native dependencies will fail.

[rnorth]

I'm afraid I was some more shade-related strangeness after this - failures occurring during the test phase of the mysql module:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test (default-test) on project mysql: Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test failed: There was an error in the forked process
[ERROR] java.lang.SecurityException: Invalid signature file digest for Manifest main attributes
[ERROR] at sun.security.util.SignatureFileVerifier.processImpl(SignatureFileVerifier.java:284)
[ERROR] at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:238)
[ERROR] at java.util.jar.JarVerifier.processEntry(JarVerifier.java:316)
[ERROR] at java.util.jar.JarVerifier.update(JarVerifier.java:228)
[ERROR] at java.util.jar.JarFile.initializeVerifier(JarFile.java:383)
[ERROR] at java.util.jar.JarFile.getInputStream(JarFile.java:450)
[ERROR] at sun.misc.URLClassPath$JarLoader$2.getInputStream(URLClassPath.java:940)

... etc ...

To resolve I've had to add exclusions for the bouncy castle library SF and DSA files for JDBC and Selenium modules (which are now shaded too). I'm afraid I've run out of time this evening to fully test, but have included this extra commit in a branch - will leave tests running overnight.

[raphw]

I think it is required to actually shade bouncy castle as well and remove the signature files from there. I included this now in the PR.

[rnorth]

Thanks, but I've hit the same build error as before at the same point with this.
It affects builds on Mac and Ubuntu, though curiously the Travis and Circle CI builds seem fine.

I've confirmed I'm using unmodified d8ef647 in both environments, just in case 😉 !

[rnorth]

Combining together with removing the certs seems to be working OK. I've raised as #181 and will replace this PR. Thank you.