Sanitize URLs in exception messages

[rcdailey]

In normal logging, Sonarr URLs are sanitized: The hostname and the API key are obfuscated. This makes sharing logs not a security risk.

When an exception is thrown due to some HTTP failure, the URL is not sanitized. This is a different code path. Example:

[DBG] HTTP Request to http://hostname:8989/api/v3/system/status?apikey=SNIP
[DBG] HTTP Response (No response) from http://hostname:8989/api/v3/system/status?apikey=SNIP
[ERR] HTTP error while communicating with Sonarr
Flurl.Http.FlurlHttpException: Call failed. No connection could be made because the target machine actively refused it
. (localhost:8989): GET http://localhost:8989/api/v3/system/status?apikey=2424b3643507485ea2e06382d3f0b8a3
 ---> System.Net.Http.HttpRequestException: No connection could be made because the target machine actively refused it
. (localhost:8989)

[rcdailey]

While the target for this was mainly Radarr, I believe this applies to Sonarr as well. I haven't thoroughly tested it but I will reopen this if I find an issue.