Split the default cookbook in 2: agent and virusscan
If an url is not filled in a message is given on that fact and the
cookbooks continues.
The 2 new recipes are included in the default, but the 'agent' and
'virusscan' recipes can be called separately.
Requirementrs and usage are kept the same
Use "Chef::Log.warn" instead of just "log"
Merge pull request #1 from arieplugge/master

Split the default cookbook in 2: agent and virusscan