Cosmetics: prefer application:application:ensure_all_started/1

To be consistent with what RabbitMQ core uses.

Per discussion with @dcorbacho.

Author: michaelklishin

src/rabbit_trust_store_http_provider.erl

@@ -59,7 +59,7 @@ join_url(BaseUrl, CertPath)  ->
 
 init(Config) ->
     inets:start(httpc, [{profile, ?PROFILE}]),
-    ssl:start(),
+    application:ensure_all_started(ssl),
     Options = proplists:get_value(proxy_options, Config, []),
     httpc:set_options(Options, ?PROFILE).