hg: jdk/submit: 8233712: Limit default tests jobs based on ulimit -u setting

[sgehwolf at redhat.com]

Changeset: b899230c71a0
Author:    sgehwolf
Date:      2019-11-06 18:06 +0100
URL:       https://hg.openjdk.java.net/jdk/submit/rev/b899230c71a0

8233712: Limit default tests jobs based on ulimit -u setting
Reviewed-by: erikj, ihse

! make/RunTests.gmk
! make/RunTestsPrebuiltSpec.gmk
! make/autoconf/basics.m4
! make/autoconf/spec.gmk.in