Sources of Agent Mapping getting sorted when something is added

[mariusoe]

Currently, users can define a priority for the agent mappings' sources. Using this priority, it is possible to define a set of default values which are being overwritten by more specific ones (e.g. application configurations).

For this users can specify a list of sorces which represents the priority - the first element has the highest priority.

If a new element is added to this prioritized list of sources, the while list is getting sorted alphabetically, which destroys a user-defined order.

This should be fixed, thus, new elements are getting added to the end of the list and the existing order is not changed.