Feature backups

[mu88]

These commits enable the Cookbook to create backups of ArcGIS Server Site or the complete WebGIS (ArcGIS Server, Portal for ArcGIS, ArcGIS Data Store). It only works for Windows. There is an additional task to delete backups after a defined number of days.
The configuration is ease:

• node['arcgis']['backups']['site_backup_dir'] --> the location where the backup of ArcGIS Server Site will be placed
• node['arcgis']['backups']['webgis_backup_dir'] --> the location where the backup of ArcGIS Server Site will be placed

Under the hood, the code does the following:

1. Privilege the user node['arcgis']['run_as_user'] within Windows to log on as batch job
2. If Portal is installed --> configure WebGIS-Backup-Configuration-File <<Portal-Install-Dir>>\tools\webgisdr\Custom_webgisdr.properties
3. If Portal for ArcGIS is installed --> create a Windows Scheduled Task to call <<Portal-Install-Dir>>\webgisdr.bat with the previously configured WebGIS-Backup-Configuration-File
4. If Portal is not installed, but ArcGIS Server is --> create a Windows Scheduled Task to call <<Server-Install-Dir>>\tools\admin\backup.py with the appropriate arguments
5. Create a Windows Scheduled Task to delete backup files if they are older than a defined number of days (node['arcgis']['backups']['retention_period'])

Unfortunately, I was not able to implement step 1 with either pure Ruby or Chef code. I use the additional PowerShell Module Carbon for this - the installation of Carbon is done within a dedicated PowerShell script that I execute before Chef.
@pbobov Maybe you find a better solution.