Tests: add test to pkg/ingress package

[allenlsy]

Please describe the Improvement and/or Feature Request

Add tests to pkg/ingress package. Some functions are completed not covered.

• Client.GetIngressNetworkingV1beta1()
• Client.GetIngressNetworkingV1()
• NewIngressClient()
• Client.run()

Scope (please mark with X where applicable)

• New Functionality [ ]
• Install [ ]
• SMI Traffic Access Policy [ ]
• SMI Traffic Specs Policy [ ]
• SMI Traffic Split Policy [ ]
• Permissive Traffic Policy [ ]
• Ingress [ ]
• Egress [ ]
• Envoy Control Plane [ ]
• CLI Tool [ ]
• Metrics [ ]
• Certificate Management [ ]
• Sidecar Injection [ ]
• Logging [ ]
• Debugging [ ]
• Tests [x]
• CI System [ ]
• Demo [ ]
• Project Release [ ]

Possible use cases

Ref #1489

[shashankram]

This code will be deprecated in a future release, and we already have good coverage for those functions from the tests in pkg/catalog/ingress_test.go.

[allenlsy]

Closing the issue as test covered.