Configure Abiquo billing dashboard processes

To configure the frequency and amount of data that Abiquo will obtain from the cloud provider

On the API server, edit the abiquo.properties file and optionally these properties:
1. To change how often the platform will obtain billing data, enter a cron expression. The default expression is as follows.
```
abiquo.billing.task.cron = 0 30 0 ? * * *
```
  If the cron expression is not compatible with Quartz, the platform will use the default.
  - This tool generates valid expressions: https://www.freeformatter.com/cron-expression-generator-quartz.html. Some other commonly used tools may generate invalid expressions.
2. To configure the number of months to obtain billing data for, enter an integer months offset. The default is to get data for 2 months, but it might be interesting to go back for 6 months at least:
  abiquo.enterprise.property.billing.monthoffset=6
To optionally set the default country code for billing, on the Remote Services server, edit the abiquo.properties file and optionally set the country_code property.
abiquo.billing.azure.country_code=US
You can also override this value in your cloud tenants with an enterprise property as required.