add env vars for logging to set catsrc and channel

[QiaolingTang]

Start from logging 5.0, there have several different channels, to testing different channels, it's hard to determine the channel name in scenarios. To match logging testing requirements, adding two env vars logging_catsrc and logging_channel_name.

An example about how to set them:

export BUSHSLICER_CONFIG='
  global:
    browser: chrome
  environments:
    ocp4:
      admin_creds_spec: "https://example.com/auth/kubeconfig/*view*/"
      version: "4.8"
      logging_catsrc: "example-registry"
      logging_channel_name: "5.0"
      idp: "example-idp"
      admin_console_url: "https://console-openshift-console.apps.example.com"
'

/cc @anpingli

[anpingli]

@QiaolingTang /lgtm. @liangxia Could you review it?
BTW, for long perspective, we will have different catalog source name and channel name to different operators. Let's start think about this and consider to implement this in future.

[QiaolingTang]

/assign @liangxia @pruan-rht

[liangxia]

/lgtm

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