add a version checker for servicemix start script
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Key: SMX4-874
URL: https://issues.apache.org/jira/browse/SMX4-874
Project: ServiceMix 4
Issue Type: Improvement
Reporter: Freeman Fang
Fix For: 4.4.0
as for the upcoming 4.4 release we need run with JDK 1.6, so just add a version
checker for the startup script so if user still use JDK 1.5 give proper prompt.
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