fix: auth module dns resolution and code quality

operator/src/main/java/io/reshapr/kubernetes/operator/auth/ReshaprApiClientFactory.java

@@ -65,6 +65,10 @@ public String resolveControlPlaneUrl(String serviceName) {
     * @return The base URL of the control plane.
     */
    public String resolveControlPlaneUrl(String serviceName, String namespace, int port) {
+      // If service name already ends with the cluster local suffix, use it as is.
+      if (serviceName.endsWith(".svc.cluster.local")) {
+         return "http://" + serviceName + ":" + port;
+      }
       // If service name contains a dot, assume it's qualified with namespace.
       if (serviceName.contains(".")) {
          return "http://" + serviceName + ".svc.cluster.local:" + port;

operator/src/main/java/io/reshapr/kubernetes/operator/auth/ReshaprAuthenticationService.java

@@ -91,8 +91,10 @@ public String authenticate(String controlPlaneBaseUrl, String organization)
                   "Authentication failed with status " + response.statusCode()
                         + ": " + response.body());
          }
-      } catch (IOException | InterruptedException e) {
+      } catch (InterruptedException e) {
          Thread.currentThread().interrupt();
+         throw new ReshaprAuthenticationException("Interrupted while authenticating with reShapr control plane", e);
+      } catch (IOException e) {
          throw new ReshaprAuthenticationException("Failed to authenticate with reShapr control plane", e);
       }
    }