feat: [#675] tracker checker (HTTP tracker) supports more service address formats

Now it supports a path prefix. It will be remove by the client to build
the "scrape" URLs.

This type of URL is very common in tracker lists like in
https://newtrackon.com/.

```console
TORRUST_CHECKER_CONFIG='{
    "udp_trackers": [],
    "http_trackers": [
	"http://127.0.0.1:7070",
	"http://127.0.0.1:7070/",
	"http://127.0.0.1:7070/announce"
    ],
    "health_checks": []
}' cargo run --bin tracker_checker
```

Author: josecelano

src/console/clients/checker/checks/http.rs

@@ -28,21 +28,24 @@ pub async fn run(http_trackers: Vec<Url>, timeout: Duration) -> Vec<Result<Check
     tracing::debug!("HTTP trackers ...");
 
     for ref url in http_trackers {
+        let mut base_url = url.clone();
+        base_url.set_path("");
+
         let mut checks = Checks {
             url: url.clone(),
             results: Vec::default(),
         };
 
         // Announce
         {
-            let check = check_http_announce(url, timeout).await.map(|_| ());
+            let check = check_http_announce(&base_url, timeout).await.map(|_| ());
 
             checks.results.push((Check::Announce, check));
         }
 
         // Scrape
         {
-            let check = check_http_scrape(url, timeout).await.map(|_| ());
+            let check = check_http_scrape(&base_url, timeout).await.map(|_| ());
 
             checks.results.push((Check::Scrape, check));
         }

src/console/clients/checker/config.rs

@@ -215,7 +215,7 @@ mod tests {
         }
 
         mod http_trackers {
-            use crate::console::clients::checker::config::{Configuration, PlainConfiguration};
+            use crate::console::clients::checker::config::{Configuration, PlainConfiguration, ServiceUrl};
 
             #[test]
             fn it_should_fail_when_a_tracker_http_url_is_invalid() {
@@ -227,6 +227,41 @@ mod tests {
 
                 assert!(Configuration::try_from(plain_config).is_err());
             }
+
+            #[test]
+            fn it_should_allow_the_url_to_contain_a_path() {
+                // This is the common format for HTTP tracker URLs:
+                // http://domain.com:7070/announce
+
+                let plain_config = PlainConfiguration {
+                    udp_trackers: vec![],
+                    http_trackers: vec!["http://127.0.0.1:7070/announce".to_string()],
+                    health_checks: vec![],
+                };
+
+                let config = Configuration::try_from(plain_config).expect("Invalid plain configuration");
+
+                assert_eq!(
+                    config.http_trackers[0],
+                    "http://127.0.0.1:7070/announce".parse::<ServiceUrl>().unwrap()
+                );
+            }
+
+            #[test]
+            fn it_should_allow_the_url_to_contain_an_empty_path() {
+                let plain_config = PlainConfiguration {
+                    udp_trackers: vec![],
+                    http_trackers: vec!["http://127.0.0.1:7070/".to_string()],
+                    health_checks: vec![],
+                };
+
+                let config = Configuration::try_from(plain_config).expect("Invalid plain configuration");
+
+                assert_eq!(
+                    config.http_trackers[0],
+                    "http://127.0.0.1:7070/".parse::<ServiceUrl>().unwrap()
+                );
+            }
         }
 
         mod health_checks {