Update memory requirements in module descriptor/launch descriptor -- or look at memory usage

The current recommended memory allocation for mod-user-import is 357913941. In testing with files of 100 users, we found that actual memory requirements are more like 50% higher. With an allocation of 5368709112 we were able to successfully load 500 files of 100 users without a memory issue. However, the memory usage pattern showed that the module ramped up to 486MB and stayed there even after the load was complete, never releasing the memory.

This is new behavior since v3.2.1. If it is unintended (since AFAIK there are not many new features), perhaps it needs to be looked at.

Test environment: Honeysuckle release (mod-user-import v3.3.1).