[common] Treat custom service ports as enabled by default

[MurzNN]

Details

When I fill this structure for service:

service:
  main:
    ports:
      appservice:
        port: 9993
      webhook:
        port: 9000
      metrics:
        port: 9002

as result common library renders only single empty port in Service, instead of list of all described ports:

spec:
  type: ClusterIP
  ports:
  - port: 
    targetPort: http
    protocol: TCP
    name: http

And to make desired port configuration I need to explicitly disable default http port and enable all others, like this:

service:
  main:
    ports:
      http:
        enabled: false
      appservice:
        enabled: true
        port: 9993
      webhook:
        enabled: true
        port: 9000
      metrics:
        enabled: true
        port: 9002

Helm chart name: common

Describe the solution you'd like: I suggest to treat custom service ports as enabled by default, to not write "enabled = true" on each new port, and disable default http port if no value is specified.