Allow a more sober CPU consumption in Both PB solver.

6 jobs for master in 112 minutes and 26 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Build
passed #31437
jars-j8

00:00:24

passed #31436
java8-sonar

00:31:11

 
  Test
passed #31438
java7

00:20:35

passed #31440
maven36-java11

00:21:13

passed #31441
maven36-java13

00:21:04

passed #31439
maven36-java8

00:17:56