LSF/OpenLava template: Signal SIGINT by default to allow R to catch it gracefully

[HenrikBengtsson]

When a job is approaching it's maximum run-time limit, LSF sends a SIGINT 10 seconds before sending a SIGKILL (abrupt; not capturable).

R code can handle the SIGINT, but the 10-second heads up might be a bit tight. To adjust this, we can use LSF options -wa <action> and -wt <minutes>, e.g. -wa INT -wt 1 will give us a 60-second heads up.

Idea

Update the default LSF template to signal SIGINT 60 seconds in advance. Something like:

<%
  ## Signal SIGINT 60 seconds (1 minute) before the run-time limit
  if (is.null(resources[["wa"]])) {
    resources[["wa"]] <- "INT"
  }
  if (is.null(resources[["wt"]])) {
    resources[["wt"]] <- 1
  }
%>