Expose list of packages to remove as an attribute #99
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This follows on from my recent pull request for #90
This exposes the list of packages to be removed by the cookbook as an attribute, with the default value of that attribute preserving the existing behaviour (i.e. creates a customisation point without a breaking change).
My primary reason for exposing this was to allow users of the cookbook to override this list should it be needed (in our specific case, we have an nagios monitoring agent that requires xinetd, which we have then taken further steps to harden) without needing to fork the cookbook.
A secondary reason is that it may make unit testing this functionality (which I am looking at for a subsequent pull request) easier.
I wasn't sure on style for README changes, so welcome any feedback.