New: Add config file setting for CGNAT authentication bypass

(cherry picked from commit 4c41a4f368046f73f82306bbd73bec992392938b)

src/NzbDrone.Core/Configuration/ConfigFileProvider.cs

@@ -66,6 +66,7 @@ namespace NzbDrone.Core.Configuration
         string PostgresMainDb { get; }
         string PostgresLogDb { get; }
         string Theme { get; }
+        bool TrustCgnatIpAddresses { get; }
     }
 
     public class ConfigFileProvider : IConfigFileProvider
@@ -461,5 +462,7 @@ namespace NzbDrone.Core.Configuration
         {
             SetValue("ApiKey", GenerateApiKey());
         }
+
+        public bool TrustCgnatIpAddresses => _authOptions.TrustCgnatIpAddresses ?? GetValueBoolean("TrustCgnatIpAddresses", false, persist: false);
     }
 }

src/NzbDrone.Core/Configuration/ConfigService.cs

@@ -444,6 +444,12 @@ namespace NzbDrone.Core.Configuration
 
         public string ApplicationUrl => GetValue("ApplicationUrl", string.Empty);
 
+        public bool TrustCgnatIpAddresses
+        {
+            get { return GetValueBoolean("TrustCgnatIpAddresses", false); }
+            set { SetValue("TrustCgnatIpAddresses", value); }
+        }
+
         private string GetValue(string key)
         {
             return GetValue(key, string.Empty);