Add gateway env flag for mg undeploy API command

[renuka-fernando]

Purpose

$subject
fix https://github.com/wso2/product-apim-tooling/issues/681

Read gateway environments from --gateway-env flag and pass it to the Adapter Rest API query param environments
--gateway-env reads multiple gw envs (same as for synapse gateway) with args and set to Adapter Rest API query param with joining gw envs with ":"

Samples

$ apictl mg undeploy api --help
Undeploy an API in Microgateway by specifying name, version, environment, username and optionally vhost

Usage:
  apictl mg undeploy api [flags]

Examples:
  apictl mg undeploy api --environment dev -n petstore -v 0.0.1
  apictl mg undeploy api -n petstore -v 0.0.1 -e dev --vhost www.pets.com
  apictl mg undeploy api -n petstore -v 0.0.1 -e dev -g "Production and Sandbox" -g Label1 -g Label2
  apictl mg undeploy api -n petstore -v 0.0.1 -e dev --vhost www.pets.com --gateway-env "Production and Sandbox"
  apictl mg undeploy api -n SwaggerPetstore -v 0.0.1 --environment dev

Note: The flags --name (-n), --version (-v), --environment (-e) are mandatory.
If the flag (--gateway-env (-g)) is not provided, API will be undeployed from all deployed gateway environments.
If the flag (--vhost (-t)) is not provided, API with all VHosts will be undeployed.
The user needs to be logged in to use this command.

Flags:
  -e, --environment string    Microgateway adapter environment to be undeployed from
  -g, --gateway-env strings   Gateway environments the API needs to be undeployed from
  -h, --help                  help for api
  -n, --name string           API name
  -v, --version string        API version
  -t, --vhost string          Virtual host the API needs to be undeployed from

Global Flags:
  -k, --insecure   Allow connections to SSL endpoints without certs
      --verbose    Enable verbose mode

Test environment

macOS

[wasuradananjith]

Shall we generate docs as well for the above changes?

[renuka-fernando]

Shall we generate docs as well for the above changes?

fixed with ee5f56e