use filter ${karaf.version} instead of the hard code one to fix
archetypes/itests failure
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Key: KARAF-683
URL: https://issues.apache.org/jira/browse/KARAF-683
Project: Karaf
Issue Type: Test
Reporter: Freeman Fang
Assignee: Freeman Fang
currently it still use hardcode 2.2.1-SNAPSHOT which should be 2.2.2-SNAPSHOT
instead, we need use ${karaf.version} to avoid changing hardcoded version
after each release
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