Implement namespace support using go-sdk

[nitishkumar71]

Description

Include namespace create, update, get, list and delete support in faas-cli

Motivation and Context

• I have raised an issue to propose this change (required)
  Closes provide namespace mangement capabilities in faas-cli #977

How Has This Been Tested?

All the commands has been tested with local builds

1. namespace create command

faas-cli ns create ns-demo --label demo=true

output

Creating Namespace: ns-demo
Namespace ns-demo Created!

2. namespace list command

faas-cli ns ls

output

Namespaces:
 - ns-demo
 - openfaas-fn

3. namespace get command

faas-cli ns get ns-demo

output

Getting Namespace: ns-demo
Name:	ns-demo
Labels map[demo:true openfaas:1]
Annotations map[]

4. namespace update command

faas-cli ns update ns-demo --label demo=false
faas-cli ns get ns-demo

output

Updating Namespace: ns-demo
Namespace ns-demo Updated!
Getting Namespace: ns-demo
Name:	ns-demo
Labels map[demo:false openfaas:1]
Annotations map[]

5. namespace delete command

faas-cli ns delete ns-demo
faas-cli ns ls

output

Deleting Namespace: ns-demo
Namespace ns-demo Deleted!
Namespaces:
 - openfaas-fn

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have signed-off my commits with git commit -s
• I have added tests to cover my changes.
• All new and existing tests passed.

[alexellis]

Potentially make this one hidden? Because we want to have one going forward, it'll still work, but be less confusing (I hope)

[nitishkumar71]

Done. It has been now hidden, as well marked deprecated

[alexellis]

Could you check the --gateway flag?

Unknown flag: --gateway

[nitishkumar71]

Could you check the --gateway flag?

Unknown flag: --gateway

This is fixed. Used PersistentFlags() to pass those flags to lower level. Earlier, we had to define them to each sub-command too.

[alexellis]

Could you update help messages/formatting?

[nitishkumar71]

Tested the CLI after feedback changes, result are ok. Please note output of get command.

1. namespace create command

faas-cli ns create ns-demo --label demo=true

output

Creating Namespace: ns-demo
Namespace ns-demo Created!

2. namespace list command

faas-cli ns ls

output

Namespaces:
 - ns-demo
 - openfaas-fn

3. namespace get command

faas-cli ns get ns-demo

output

Name: ns-demo
Labels:
 demo: true
 openfaas: 1

4. namespace update command

faas-cli ns update ns-demo --label demo=false
faas-cli ns get ns-demo

output

Updating Namespace: ns-demo
Namespace ns-demo Updated!
Name: ns-demo
Labels:
 demo: false
 openfaas: 1

5. namespace delete command

faas-cli ns delete ns-demo
faas-cli ns ls

output

Deleting Namespace: ns-demo
Namespace ns-demo Deleted!
Namespaces:
 - openfaas-fn

[alexellis]

Approved