Merge pull request #600 from internetarchive/adam/restore-has-prerequisite-behavior

Reset CrawlURI status for hasPrerequisite() so that it isn't preserved between attempts

modules/src/main/java/org/archive/modules/CrawlURI.java

@@ -813,6 +813,7 @@ implements Reporter, Serializable, OverlayContext, Comparable<CrawlURI> {
         this.httpRecorder = null;
         this.fetchStatus = S_UNATTEMPTED;
         this.setPrerequisite(false);
+        this.clearPrerequisiteUri();
         this.contentSize = UNCALCULATED;
         this.contentLength = UNCALCULATED;
         // Clear 'links extracted' flag.