Test framework testing max return code

[neilbeesley]

If there is an actual system abend rather than normal termination with a numeric return code then getMaxRC() will get the following problem in the test framework:

Ý36mÝINFO¨  Ý0m(2) 0 completed jobs for ARTALL                                                     
Exception in thread "main" java.lang.NumberFormatException: For input string: "S806"                
 at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)         
 at java.base/java.lang.Integer.parseInt(Integer.java:652)                                          
 at java.base/java.lang.Integer.parseInt(Integer.java:770)                                          
 at org.genevaers.testframework.sdsf.HeldJobs.getMaxRC(HeldJobs.java:441)                           
 at org.genevaers.testframework.TestDriver.waitForJobsWithTimeout(TestDriver.java:576)              
 at org.genevaers.testframework.TestDriver.submitJobsAndWaitForCompletion(TestDriver.java:529)      
 at org.genevaers.testframework.TestDriver.runTest(TestDriver.java:250)                             
 at org.genevaers.testframework.TestDriver.runSpec(TestDriver.java:509)                             
 at org.genevaers.testframework.TestDriver.runAllTests(TestDriver.java:793)                         
 at org.genevaers.testframework.CommandLineHandler.processTheCommandLine(CommandLineHandler.java:74)
 at org.genevaers.testframework.CommandLineHandler.main(CommandLineHandler.java:49)