Improving classification for user errors (#894)

* configuring 'overlaps with cidr' as user error

* configuring 'Policy doesn't allow .* to be performed' as user error

* configuring 'missing expected router %s' as user error

pkg/apis/openstack/helper/error_codes.go

@@ -18,7 +18,7 @@ var (
 	dependenciesRegexp                  = regexp.MustCompile(`(?i)(PendingVerification|Access Not Configured|accessNotConfigured|DependencyViolation|OptInRequired|Conflict|inactive billing state|timeout while waiting for state to become|InvalidCidrBlock|already busy for|internal server error|A resource with the ID|There are not enough hosts available|No Router found)`)
 	retryableDependenciesRegexp         = regexp.MustCompile(`(?i)(RetryableError)`)
 	resourcesDepletedRegexp             = regexp.MustCompile(`(?i)(not available in the current hardware cluster|out of stock)`)
-	configurationProblemRegexp          = regexp.MustCompile(`(?i)(not supported in your requested Availability Zone|notFound|Invalid value|violates constraint|no attached internet gateway found|Your query returned no results|invalid VPC attributes|unrecognized feature gate|runtime-config invalid key|strict decoder error|not allowed to configure an unsupported|error during apply of object .* is invalid:|duplicate zones|overlapping zones)`)
+	configurationProblemRegexp          = regexp.MustCompile(`(?i)(missing expected router|Policy doesn't allow .* to be performed|overlaps with cidr|not supported in your requested Availability Zone|notFound|Invalid value|violates constraint|no attached internet gateway found|Your query returned no results|invalid VPC attributes|unrecognized feature gate|runtime-config invalid key|strict decoder error|not allowed to configure an unsupported|error during apply of object .* is invalid:|duplicate zones|overlapping zones)`)
 	retryableConfigurationProblemRegexp = regexp.MustCompile(`(?i)(is misconfigured and requires zero voluntary evictions|SDK.CanNotResolveEndpoint|The requested configuration is currently not supported)`)
 
 	// KnownCodes maps Gardener error codes to respective regex.