Test: increase security index wait times

Our tests currently rely on waiting for the security index to be available in some cases and in
CI, these checks have been timing out. This commit increases the amount of time that we will wait
for the index before failing to account for slow machines.

Original commit: elastic/x-pack-elasticsearch@639dccd5cb

plugin/src/test/java/org/elasticsearch/test/SecurityIntegTestCase.java

@@ -468,7 +468,7 @@ public abstract class SecurityIntegTestCase extends ESIntegTestCase {
                         assertTrue(indexRoutingTable.allPrimaryShardsActive());
                     }
                 }
-            });
+            }, 30L, TimeUnit.SECONDS);
         }
     }
 
@@ -485,7 +485,7 @@ public abstract class SecurityIntegTestCase extends ESIntegTestCase {
                         assertTrue(indexRoutingTable.allPrimaryShardsActive());
                     }
                 }
-            }, 20, TimeUnit.SECONDS);
+            }, 30L, TimeUnit.SECONDS);
         }
     }