Add ability to show last operation result in app get. Show path in app list -o wide

[jessesuen]

Output format when --show-operation is supplied.

$ argocd app get argocd-cdp  --show-operation
Name:          argocd-cdp
Server:        REDACTED
Namespace:     dev-deploy-argocd-us-west-2-prod-cdp
URL:           REDACTED
Environment:   cdp
Repo:          REDACTED
Path:          argocd
Target:        HEAD

Operation:     Sync
  Phase:       Succeeded
  Start:       2018-06-18 11:16:26 -0700 PDT
  Finished:    2018-06-18 11:16:31 -0700 PDT
  Duration:    5s
  Phase:       Succeeded
  Message:     successfully synced

KIND            NAME                                 STATUS  HEALTH   OPERATIONMSG
ServiceAccount  application-controller               Synced  Healthy  serviceaccount "application-controller" unchanged
Deployment      application-controller               Synced  Healthy  deployment.apps "application-controller" unchanged
Role            application-controller-role          Synced  Healthy  role.rbac.authorization.k8s.io "application-controller-role" unchanged
RoleBinding     application-controller-role-binding  Synced  Healthy  rolebinding.rbac.authorization.k8s.io "application-controller-role-binding" unchanged
ServiceAccount  argocd-server                        Synced  Healthy  serviceaccount "argocd-server" unchanged
Role            argocd-server-role                   Synced  Healthy  role.rbac.authorization.k8s.io "argocd-server-role" unchanged
RoleBinding     argocd-server-role-binding           Synced  Healthy  rolebinding.rbac.authorization.k8s.io "argocd-server-role-binding" unchanged
Deployment      argocd-server                        Synced  Healthy  deployment.apps "argocd-server" unchanged
Service         argocd-server                        Synced  Healthy  service "argocd-server" unchanged
ConfigMap       argocd-cm                            Synced  Healthy  configmap "argocd-cm" unchanged
ConfigMap       argocd-rbac-cm                       Synced  Healthy  configmap "argocd-rbac-cm" unchanged
Deployment      argocd-repo-server                   Synced  Healthy  deployment.apps "argocd-repo-server" unchanged
Service         argocd-repo-server                   Synced  Healthy  service "argocd-repo-server" unchanged