`zwe validate port` - check for uniqueness

[Martin-Zeithaml]

I did not check the command yet, but I think we don't check the ports to be unique:

zowe:
  components:
    something1:
      enabled: true
      port: 123
    something2:
      enabled: true
      port: 123
    something3:
      enabled: false
      port: 123

The bind test checks the given port, the example above can succeed, but there is a port conflict.
This conflict will be detected anyway, as the second (started) component will not be able to use such port.

This check should be easy to implement - it can cover a special situation, when the component is taken from defaults and user is not aware of that:

components:
  gateway:
    enabled: true
    port: 7558    # <--- customized, gateway is usually 7554 in our examples, but why not
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# zaas not defined here in config, but defined in defaults with port 7558
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

zowe-install-packaging/files/defaults.yaml

Lines 206 to 209 in cdeace0

	zaas:
	enabled: true
	port: 7558
	debug: false