Limit maximum number of open file descriptors to overcome titan bug

Without this, titan tries to allocate too much memory and triggers OOM
under some systems (happening here with 16GB of RAM).

Related: https://gitlab.eclipse.org/eclipse/titan/titan.core/-/issues/690
Change-Id: Iafa8cfa769386e63e1d879d8cce6e24b244d9a6f
1 file changed