Merge branch 'stable-2.9'

* stable-2.9:
  Link to solved issues from 2.9 release notes
  Reindex: Include exception cause when dying
  Fix the request wrapper for http requests served from plugins
  Fix a possibility to overcome BLOCK permission
  Add asciidoc build back in the Documentation folder
  Change CopyableLabel to hide onKeyUp

Conflicts:
	gerrit-server/src/main/java/com/google/gerrit/server/project/PermissionCollection.java

Change-Id: I1ebcc44873eb12acd80b4a0a98d22a73c69a886c

gerrit-pgm/src/main/java/com/google/gerrit/pgm/Reindex.java

@@ -155,7 +155,7 @@ public class Reindex extends SiteProgram {
       result = indexAll();
       index.markReady(true);
     } catch (Exception e) {
-      throw die(e.getMessage());
+      throw die(e.getMessage(), e);
     }
     sysManager.stop();
     dbManager.stop();