Overhaul the query history tab to allow browsing of the history and full query text. Fixes #2282

Patch by Joao and the team at Pivotal.

web/regression/feature_utils/app_starter.py

@@ -41,7 +41,6 @@ class AppStarter:
         )
 
         self.driver.set_window_size(1024, 1024)
-        time.sleep(10)
         self.driver.get(
             "http://" + self.app_config.DEFAULT_SERVER + ":" +
             random_server_port)

web/regression/feature_utils/pgadmin_page.py

@@ -27,7 +27,7 @@ class PgadminPage:
     def __init__(self, driver, app_config):
         self.driver = driver
         self.app_config = app_config
-        self.timeout = 20
+        self.timeout = 30
         self.app_start_timeout = 60
 
     def reset_layout(self):