Issue Summary

CSP plugin OSGi dependency error repeatedly logged at Bitbucket Mirror 10.2 startup

Steps to Reproduce

1. Install Bitbucket 10.2 as a Mirror instance
2. Start the mirror service.
3. Check the mirror log (atlassian-bitbucket.log) around startup time.

Expected Results

If the plugin is not required on mirrors, it should be packaged/marked such that it does not attempt to start and therefore does not log an ERROR. 

Actual Results

The following exception is thrown in the atlassian-bitbucket.log file:

Cannot determine required plugins, cannot resolve bundle 'com.atlassian.bitbucket.server.bitbucket-content-security-policy'Detected an error (BundleException) enabling the plugin 'com.atlassian.bitbucket.server.bitbucket-content-security-policy' :Unable to resolve com.atlassian.bitbucket.server.bitbucket-content-security-policy [21](R 21.0): missing requirement [com.atlassian.bitbucket.server.bitbucket-content-security-policy [21](R 21.0)] osgi.wiring.package; (osgi.wiring.package=com.atlassian.plugins.cdn.api)

This doesn't affect the Startup and Mirror functionality. 

Workaround

Currently there is no known workaround for this behaviour. A workaround will be added here when available.