Add ssh command "test-submit-rule"

The command creates a fresh prolog environment and loads a prolog script
either from stdin or rules.pl in the project refs/meta/config branch
depending on the options used.
can_submit/1 is then queried and the results are returned in human
readable text or json.

Change-Id: I246a89f9f35718320b69ec43ddf11fbe002ed566

gerrit-server/src/main/java/com/google/gerrit/server/project/ChangeControl.java

@@ -571,7 +571,7 @@ public class ChangeControl {
         && who.arg(0).isInteger();
   }
 
-  private static Term toListTerm(List<Term> terms) {
+  public static Term toListTerm(List<Term> terms) {
     Term list = Prolog.Nil;
     for (int i = terms.size() - 1; i >= 0; i--) {
       list = new ListTerm(terms.get(i), list);