Remove obsolete SpringSource and OW2 repository dependencies

[wilx]

Summary

• replace Event Admin's hard-coded SpringSource JUnit bundle with the ServiceMix JUnit 4.12 bundle expected by Pax Exam 4.13.1
• replace the remaining iPOJO SpringSource JUnit/Hamcrest workarounds with a ServiceMix JUnit 4.11 bundle matching Pax Exam 3.0.0
• replace the quickstart's SpringSource Servlet bundle with the OSGi-enabled javax.servlet-api 4.0.1 artifact from Maven Central
• remove the orphaned OW2 repository and stale Chameleon JSON assembly include
• use the released iPOJO Web Console plugin 1.7.0 instead of the unavailable 1.7.0-SNAPSHOT

Verification

• JAVA_HOME=/opt/jdks/latest-8 mvn -f eventadmin/impl/pom.xml clean verify
  • 8 unit tests passed
  • Pax Exam stress integration test passed, processing 1,050,000 events
• JAVA_HOME=/opt/jdks/latest-8 mvn -f ipojo/distributions/ipojo-webconsole-quicktart/pom.xml clean verify
  • build succeeded
  • ZIP and tar.gz distributions were generated
• verified the replacement Servlet and ServiceMix artifacts resolve from Maven Central and contain OSGi bundle metadata

Notes

The legacy iPOJO handler integration-test reactors do not currently reach their tests: their missing bundle-plugin version selects maven-bundle-plugin 6.1.0, which requires Java 17, while these projects target Java 5/6. The affected helper methods are not referenced by the current test configurations.

Event Admin verification on Java 17 also encounters a legacy Bnd 4.2.1 ConcurrentModificationException during packaging; the full Java 8 build passes.