Correct logic for determining # of threads to run with

Should use the minimum of 8 and #cores, not max. If we have 12 cores, we want to only use 8 of them. If we have 4 cores, we want to use 4 cores. Current logic is running with far too many threads, different to documentation.

build.gradle

@@ -22,7 +22,7 @@ plugins {
 }
 
 group = 'cd.go.gocd'
-version = '1.0.3'
+version = '1.0.4'
 
 project.ext.projectDesc = [
   id         : 'cd.go.gocd.gocd-database-migrator',

src/main/java/com/thoughtworks/go/dbsync/cli/Args.java

@@ -63,7 +63,7 @@ public class Args {
     public boolean progress = false;
 
     @Parameter(names = {"--threads", "-t"}, description = "Number of import threads. Defaults to number of processors (max of 8).", order = 1400)
-    public int threads = Math.max(8, Runtime.getRuntime().availableProcessors());
+    public int threads = Math.min(8, Runtime.getRuntime().availableProcessors());
 
     @Parameter(names = {"--export-timeout"}, description = "Number of seconds to allow data to be exported from source to target database before timing out.", order = 1500)
     public long exportTimeoutSeconds = TimeUnit.MINUTES.toSeconds(30);