Detect and raise setup warnings from within Phabricator

Summary:
This is basicaly a light version of D4286. The major problem with D4286 is that it's a huge leap and completely replaces the setup process in one step.

Instead, I want to do this:

  - Add the post-setup warnings (yellow bar with "6 unresolved warnings...").
  - Copy all setup checks into post-setup warnings (so every check has an old-style check and a new-style check).
  - Run that for a little bit and make sure it's stable.
  - Implement fatal post-setup checks (the red screen, vs the yellow bar).
  - Run that for a little bit.
  - Nuke setup mode and delete all the old checks.

This should give us a bunch of very gradual steps toward the brave new world of simpler setup.

Test Plan:
 - Faked APC setup failures, saw warnings raise.
 - Verified that this runs after restart (get + set).
 - Verified that this costs us only one cache hit after first-run (get only).

Reviewers: btrahan, codeblock, vrana, chad

Reviewed By: codeblock

CC: aran

Maniphest Tasks: T2228

Differential Revision: https://secure.phabricator.com/D4295

src/applications/config/controller/PhabricatorConfigIssueListController.php

@@ -0,0 +1,65 @@
+<?php
+
+final class PhabricatorConfigIssueListController
+  extends PhabricatorConfigController {
+
+  public function processRequest() {
+    $request = $this->getRequest();
+    $user = $request->getUser();
+
+    $nav = $this->buildSideNavView();
+
+    $issues = PhabricatorSetupCheck::runAllChecks();
+    PhabricatorSetupCheck::setOpenSetupIssueCount(count($issues));
+
+    $list = $this->buildIssueList($issues);
+    $list->setNoDataString(pht("There are no open setup issues."));
+
+    $header = id(new PhabricatorHeaderView())
+      ->setHeader(pht('Open Phabricator Setup Issues'));
+
+    $nav->appendChild(
+      array(
+        $header,
+        $list,
+      ));
+
+    $title = pht('Setup Issues');
+
+    $crumbs = $this
+      ->buildApplicationCrumbs($nav)
+      ->addCrumb(
+        id(new PhabricatorCrumbView())
+          ->setName($title)
+          ->setHref($this->getApplicationURI('issue/')));
+
+    $nav->setCrumbs($crumbs);
+
+    return $this->buildApplicationPage(
+      $nav,
+      array(
+        'title' => $title,
+        'device' => true,
+      )
+    );
+  }
+
+  private function buildIssueList(array $issues) {
+    assert_instances_of($issues, 'PhabricatorSetupIssue');
+    $list = new PhabricatorObjectItemListView();
+
+    foreach ($issues as $issue) {
+      $href = $this->getApplicationURI('/issue/'.$issue->getIssueKey().'/');
+      $item = id(new PhabricatorObjectItemView())
+        ->setHeader($issue->getName())
+        ->setHref($href)
+        ->setBarColor('yellow')
+        ->addIcon('warning', pht('Setup Warning'))
+        ->addAttribute($issue->getSummary());
+      $list->addItem($item);
+    }
+
+    return $list;
+  }
+
+}