Adding APIs to reload config, recycle db connections and ping server (#3096)

* Adding APIs to reload config, recycle db connections and ping server

* Fixing unit test

* Adding unit tests

i18n/en.json

@@ -47,6 +47,10 @@
     "id": "September",
     "translation": "September"
   },
+  {
+    "id": "api.general.init.debug",
+    "translation": "Initializing general api routes"
+  },
   {
     "id": "api.admin.file_read_error",
     "translation": "Error reading log file"
@@ -63,6 +67,14 @@
     "id": "api.admin.init.debug",
     "translation": "Initializing admin api routes"
   },
+  {
+    "id": "api.admin.recycle_db_start.warn",
+    "translation": "Attempting to recycle the database connection"
+  },
+  {
+    "id": "api.admin.recycle_db_end.warn",
+    "translation": "Finished recycling the database connection"
+  },
   {
     "id": "api.admin.test_email.body",
     "translation": "<br/><br/><br/>It appears your Mattermost email is setup correctly!"