adds checksum

[spuder]

The windows_package resource will download the agent over and over unless you provide a checksum.

If the checksum is missing, the behavior will continue exactly the same.
If the checksum is provided, it will prevent redownloads. Your site operators will thank you.

Note: I have not been able to test this because there appear to be problems with the vagrant box in test kitchen.

[spuder]

After further investigation, I'm not fully convinced that the cookbook is downloading the msi every chef run. Nevertheless its still good practice to allow users to validate files

Recipe: appdynamics::dotnet_agent
  * directory[temp] action create (up to date)
  * windows_service[MSDTC] action enable (up to date)
  * windows_service[MSDTC] action start (up to date)
  * windows_service[Winmgmt] action enable (up to date)
  * windows_service[Winmgmt] action start (up to date)
  * windows_service[COMSysApp] action enable (skipped due to only_if)
  * windows_service[COMSysApp] action start (skipped due to only_if)
  * windows_feature[IIS-RequestMonitor] action install (up to date)
  * windows_package[AppDynamics .NET Agent] action install
  Recipe: <Dynamically Defined Resource>
    * remote_file[C:\chef\cache\package\dotNetAgentSetup64-4.1.7.2.msi] action create (up to date)
     (up to date)
Recipe: appdynamics::dotnet_agent
  * template[C:\ProgramData\AppDynamics\DotNetAgent\Config\config.xml] action create (up to date)
  * windows_service[AppDynamics.Agent.Coordinator_service] action enable (up to date)
  * windows_service[AppDynamics.Agent.Coordinator_service] action start (up to date)
Starting audit phase