proxy: improve test performance (#8863)

Some tests were very slow and some tests occasionally stalled. This PR
improves some test performance and replaces the custom threadpool in
order to fix the stalling of tests.

proxy/src/auth/backend/jwt.rs

@@ -500,6 +500,7 @@ mod tests {
     use hyper1::service::service_fn;
     use hyper_util::rt::TokioIo;
     use rand::rngs::OsRng;
+    use rsa::pkcs8::DecodePrivateKey;
     use signature::Signer;
     use tokio::net::TcpListener;
 
@@ -517,8 +518,8 @@ mod tests {
         (sk, jwk)
     }
 
-    fn new_rsa_jwk(kid: String) -> (rsa::RsaPrivateKey, jose_jwk::Jwk) {
-        let sk = rsa::RsaPrivateKey::new(&mut OsRng, 2048).unwrap();
+    fn new_rsa_jwk(key: &str, kid: String) -> (rsa::RsaPrivateKey, jose_jwk::Jwk) {
+        let sk = rsa::RsaPrivateKey::from_pkcs8_pem(key).unwrap();
         let pk = sk.to_public_key().into();
         let jwk = jose_jwk::Jwk {
             key: jose_jwk::Key::Rsa(pk),
@@ -569,10 +570,70 @@ mod tests {
         format!("{payload}.{sig}")
     }
 
+    // RSA key gen is slow....
+    const RS1: &str = "-----BEGIN PRIVATE KEY-----
+MIIEvwIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQDNuWBIWTlo+54Y
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+8LMFlz1QPqSZYN/A/kOcLBfa3A==
+-----END PRIVATE KEY-----
+";
+    const RS2: &str = "-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDipm6FIKSRab3J
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+-----END PRIVATE KEY-----
+";
+
     #[tokio::test]
     async fn renew() {
-        let (rs1, jwk1) = new_rsa_jwk("1".into());
-        let (rs2, jwk2) = new_rsa_jwk("2".into());
+        let (rs1, jwk1) = new_rsa_jwk(RS1, "1".into());
+        let (rs2, jwk2) = new_rsa_jwk(RS2, "2".into());
         let (ec1, jwk3) = new_ec_jwk("3".into());
         let (ec2, jwk4) = new_ec_jwk("4".into());