All forkers will no longer be incremented. Proper forker selected.

I don't even know how I missed this in preliminary testing.  The forker
increment is now fixed when using multiple forkers.  Additionally, the
first forker in the list was always getting used regardless of status,
which kind of defeats the entire point of this patch.

src/lib/Components/system/base_pg_manager.py

@@ -117,15 +117,18 @@ class ProcessGroupManager(object): #degenerate with ProcessMonitor.
 
         '''
         selected_forker = None
-        ordered_forkers = [f[0] for f in sorted(self.forker_taskcounts.items(), key=lambda x:x[1])]
+        ordered_forkers = [f[0] for f in sorted(self.forker_taskcounts.items(), key=lambda x: x[1])]
         if len(ordered_forkers) < 0:
             raise RuntimeError("Job %s: No forkers registered!", jobid)
         else:
+            count = 0
             for forker in ordered_forkers:
                 if self.forker_reachable[forker]:
-                    selected_forker = ordered_forkers[0] #this is now a tuple
+                    selected_forker = ordered_forkers[count]
                     self.forker_taskcounts[selected_forker] += 1
                     _logger.info("Job %s using forker %s", jobid, selected_forker)
+                    break
+                count += 1
         if selected_forker is None:
             # We didn't find a forker, raise a RuntimeError for this
             raise RuntimeError("Job %s: No valid forkers found!" % jobid)