This is a huge commit, it does following things:

1. refactor kubesphere dependency service client creation, we can
disable dependency by config
2. dependencies can be configured by configuration file
3. refactor cmd package using cobra.Command, so we can use hypersphere
to invoke command sepearately. Later we only need to build one image to
contains all kubesphere core components. One command to rule them all!
4. live reloading configuration currently not implemented

pkg/simple/client/servicemesh/options.go

@@ -0,0 +1,59 @@
+package servicemesh
+
+import "github.com/spf13/pflag"
+
+type ServiceMeshOptions struct {
+
+	// istio pilot discovery service url
+	IstioPilotHost string `json:"istioPilotHost,omitempty" yaml:"istioPilotHost,omitempty"`
+
+	// jaeger query service url
+	JaegerQueryHost string `json:"jaegerQueryHost,omitempty" yaml:"jaegerQueryHost,omitempty"`
+
+	// prometheus service url for servicemesh metrics
+	ServicemeshPrometheusHost string `json:"servicemeshPrometheusHost,omitempty" yaml:"servicemeshPrometheusHost,omitempty"`
+}
+
+// NewServiceMeshOptions returns a `zero` instance
+func NewServiceMeshOptions() *ServiceMeshOptions {
+	return &ServiceMeshOptions{
+		IstioPilotHost:            "",
+		JaegerQueryHost:           "",
+		ServicemeshPrometheusHost: "",
+	}
+}
+
+func (s *ServiceMeshOptions) Validate() []error {
+	errors := []error{}
+
+	return errors
+}
+
+func (s *ServiceMeshOptions) ApplyTo(options *ServiceMeshOptions) {
+	if options == nil {
+		return
+	}
+
+	if s.ServicemeshPrometheusHost != "" {
+		options.ServicemeshPrometheusHost = s.ServicemeshPrometheusHost
+	}
+
+	if s.JaegerQueryHost != "" {
+		options.JaegerQueryHost = s.JaegerQueryHost
+	}
+
+	if s.IstioPilotHost != "" {
+		options.IstioPilotHost = s.IstioPilotHost
+	}
+}
+
+func (s *ServiceMeshOptions) AddFlags(fs *pflag.FlagSet) {
+	fs.StringVar(&s.IstioPilotHost, "istio-pilot-host", s.IstioPilotHost, ""+
+		"istio pilot discovery service url")
+
+	fs.StringVar(&s.JaegerQueryHost, "jaeger-query-host", s.JaegerQueryHost, ""+
+		"jaeger query service url")
+
+	fs.StringVar(&s.ServicemeshPrometheusHost, "servicemesh-prometheus-host", s.ServicemeshPrometheusHost, ""+
+		"prometheus service for servicemesh")
+}