Don't use the system_rebuild_module_data() function to retrieve the installed modules

Problem/Motivation

The system_rebuild_module_data() function is used to retrieve the installed modules but this is not the best way to obtain this info because this functions performs others actions that are not necessary.

Proposed resolution

Change the system_rebuild_module_data() function for the system_get_info() function

Remaining tasks

None.

User interface changes

None.

API changes

None.

Data model changes

None.