NMS-14759: re-enable Sonar in Foundation 2022

[RangerRick]

This PR fixes Sonar running in Foundation 2022, and makes a number of general improvements.

• (slightly) smarter cache handling for sonar
• add support for the jacoco agent to horizon, minion, and sentinel startup scripts (JACOCO_AGENT_ENABLED=1 env var)
• enable jacoco coverage reports for smoke test runs of horizon (minion and sentinel don't allow vm: access for JMX)
• push report-generation to the coverage (sonar.sh) run to synthesize integration and smoke test runs into a single report
• update the coverage packing and unpacking scripts to handle multiple types of runs without stepping on filenames
• backport some of my previous sonar improvements from develop

External References

• JIRA (Issue Tracker): http://issues.opennms.org/browse/NMS-14759

[RangerRick]

Dammit Sonar! Making me look bad.