Upgrade upstream versions

Upgrade upstream versions

Where possible rely on odlparent:
* maven.javadoc.version
* Jacoco configuration
* xmlunit
* javassist
* xml-apis
* osgi-core
* javax.ws.rs-api
* reporting configuration

Update the following dependencies:
* maven-verifier 1.5 -> 1.6
* groovy 2.1.6 -> 2.4.5
* maven-core, maven-plugin-api 3.1.1 -> 3.3.3
* xtend 2.7.3 -> 2.8.4
* jersey-client 2.0 -> 2.22
* argparse4j 0.4.3 -> 0.6.0
* maven-plugin-annotations 3.2 -> 3.4
* maven-artifact 2.0 -> 3.3.3
* build-helper-maven-plugin 1.8 -> 1.9.1

Drop the equinoxSDK381:org.eclipse.osgi which appears to no longer be
necessary.

Drop third-party which is no longer used.

Change-Id: Iaae8b41eba4dce31ed02ccd4bd5716d9f9db79a3
Signed-off-by: Stephen Kitt <skitt@redhat.com>
Signed-off-by: Robert Varga <robert.varga@pantheon.sk>