SLE-1046: Remove unused dependencies / update used ones #800
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SLE-1046
Summary
Remove the unused dependency, Eclipse PDT, as PHP projects can run without it. This simplifies the build a bit more.
Update Eclipse Tycho and the Maven Jar Signer plug-in as they're build dependencies.
Update (integration) test dependencies and remove the Orchestrator dependency
minimal-json
from the IT axes that don't require it, this speeds up the build by a bit.