systemd: remove limit on fork() branching factor
systemd: remove limit on fork() branching factor

On distributions using systemd, a default limit on the number of
tasks allowed to be created from a given unit may be set by default
(e.g., on F24, "DefaultTasksAccounting=yes" and "DefaultTasksMax=512"
are set in /etc/systemd/system.conf. A large CORE simulation may well
exceed that limit, at least during startup when many (sub)shell
processes are generated using fork().

To avoid running into this limit, set "TasksMax=infinity" in the
core-daemon.service unit file template.

Signed-off-by: Gabriel Somlo <21ac1e587e9b684f27b1dd7bb0c255340ad5fde8@cert.org>

coreemu/core,coreemu/core,coreemu/core,coreemu/core