Make scanners able to "watch" scanned resources for changes 
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                 Key: PAXRUNNER-114
                 URL: http://issues.ops4j.org/jira/browse/PAXRUNNER-114
             Project: Pax Runner
          Issue Type: New Feature
          Components: provision service
            Reporter: Alin Dreghiciu
            Assignee: Alin Dreghiciu
            Priority: Minor


Currently scanners know how to scan specific resources and this is done on 
request of provision service.
It can be interesting if provision service will support "monitoring" of the 
scanned resource and react on changes. For example for dir scanner the scanned 
directory can be monitored and if there are bundles added/removed from that 
directory the bundle will be installed/uninstalled from the platform. For an 
file scanner it will monitor the scanned file for changes. If content of file 
changes bundles are again installed/uninstalled.

An option to implement this can be to allow an extra option on the scan-x urls 
to specify the interval between the scans. If this option is not specified then 
they will act as before (no rescan) and if it is specified then a scanning 
process is repeated after the specified time interval.

This should be supported for stand alone use of scanners not when they run as 
part of pax runner.

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