improve help output for deploy command to list common flags first about kapp HOT 2 CLOSED

$ kapp deploy -h
Deploy app

Usage:
  kapp deploy [flags]

Aliases:
  deploy, d, dep

Examples:

  # Deploy app 'app1' based on config files in config/
  kapp deploy -a app1 -f config/

  # Deploy app 'app1' while showing full text diff
  kapp deploy -a app1 -f config/ --diff-changes

  # Deploy app 'app1' based on remote file
  kapp deploy -a app1 \
    -f https://github.com/...download/v0.6.0/crds.yaml \
    -f https://github.com/...download/v0.6.0/release.yaml

Common Flags:
  -a, --app string                                           Set app name (or label selector) (format: name, key=val, !key)
  -c, --diff-changes                                         Show changes
  -f, --file strings                                         Set file (format: /tmp/foo, https://..., -) (can repeat)
  -n, --namespace string                                     Specified namespace ($KAPP_NAMESPACE or default from kubeconfig)

Diff Flags:
      --diff-against-last-applied                            Show changes against last applied copy when possible (default true)
  -c, --diff-changes                                         Show changes
      --diff-context int                                     Show number of lines around changed lines (default 2)
      --diff-run                                             Show diff and exit successfully without any further action
      --diff-summary                                         Show diff summary (default true)

Apply Flags:
      --apply-concurrency int                                Maximum number of concurrent apply operations (default 5)
      --apply-default-update-strategy string                 Change default update strategy
      --apply-ignored                                        Set to apply ignored changes
      --dangerous-allow-empty-list-of-resources              Allow to apply empty set of resources (same as running kapp delete)
      --dangerous-override-ownership-of-existing-resources   Steal existing resources from another app

Wait Flags:
      --wait                                                 Set to wait for changes to be applied (default true)
      --wait-check-interval duration                         Amount of time to sleep between checks while waiting (default 1s)
      --wait-ignored                                         Set to wait for ignored changes to be applied
      --wait-timeout duration                                Maximum amount of time to wait (default 15m0s)

Resource Filter Flags:
      --filter string                                        Set filter (example: {"and":[{"not":{"resource":{"kind":"foo%"}}},{"resource":{"kind":"!foo"}}]})
      --filter-age string                                    Set age filter (example: 5m, 500h+, 10m-)
      --filter-kind strings                                  Set kinds filter (example: Pod) (can repeat)
      --filter-kind-ns strings                               Set kind-namespace filter (example: Pod/, Pod/knative-serving) (can repeat)
      --filter-kind-ns-name strings                          Set kind-namespace-name filter (example: Deployment/knative-serving/controller) (can repeat)
      --filter-name strings                                  Set name filter (example: controller) (can repeat)
      --filter-ns strings                                    Set namespace filter (example: knative-serving) (can repeat)

Resource Validation Flags:
      --allow-all-ns                                         Set to allow all namespaces for resources (does not apply to the app itself)
      --allow-check                                          Enable client-side allowing
      --allow-cluster                                        Set to allow cluster level for resources (does not apply to the app itself)
      --allow-ns strings                                     Set allowed namespace for resources (does not apply to the app itself)

Resource Mangling Flags:
      --into-ns string                                       Place resources into namespace
      --map-ns strings                                       Map resources from one namespace into another (could be specified multiple times)

Logs Flags:
      --logs                                                 Show logs from Pods annotated as 'kapp.k14s.io/deploy-logs' (default true)
      --logs-all                                             Show logs from all Pods

Available/Other Flags:
  -h, --help                                                 help for deploy
      --labels strings                                       Set app label (format: key=val, key=) (can repeat)
  -p, --patch                                                Add or update provided resources
      --sort                                                 Sort by namespace, name, etc. (default true)

Global Flags:
      --color                       Set color output (default true)
      --column strings              Filter to show only given columns
      --json                        Output as JSON
      --kubeconfig string           Path to the kubeconfig file ($KAPP_KUBECONFIG)
      --kubeconfig-context string   Kubeconfig context override ($KAPP_KUBECONFIG_CONTEXT)
      --tty                         Force TTY-like output (default true)
  -y, --yes                         Assume yes for any prompt

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