Add support for external es using https

Created by: wanjunlei

Signed-off-by: wanjunlei wanjunlei@yunify.com

With this pr, it supports to use of an es cluster that enabled HTTPS to store logging, events, and auditing logs.

We can use an external es cluster that enabled HTTPS like this.

apiVersion: installer.kubesphere.io/v1alpha1
kind: ClusterConfiguration
metadata:
  name: ks-installer
  namespace: kubesphere-system
spec:
  common:
    es:
      basicAuth:
        enabled: true
        password: R5HN2Ji6ZC9wR4Ifm574l2p0
        username: elastic
      elkPrefix: logstash
      externalElasticsearchPort: "30730"
      externalElasticsearchProtocol: https
      externalElasticsearchUrl: 192.168.0.4