eventsapi: JSON output and different error codes

JSON outputs are added to all commands, use `--json` to
get JSON output.

Following error codes are added to differenciate between errors.
Any other Unknown errors will have return code 1

ERROR_SAME_CONFIG             = 2
ERROR_ALL_NODES_STATUS_NOT_OK = 3
ERROR_PARTIAL_SUCCESS         = 4
ERROR_WEBHOOK_ALREADY_EXISTS  = 5
ERROR_WEBHOOK_NOT_EXISTS      = 6
ERROR_INVALID_CONFIG          = 7
ERROR_WEBHOOK_SYNC_FAILED     = 8
ERROR_CONFIG_SYNC_FAILED      = 9

Also hidden `node-` commands in the help message.

> Reviewed-on: http://review.gluster.org/15867
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Prashanth Pai <ppai@redhat.com>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>

BUG: 1400845
Change-Id: I962b5435c8a448b4573059da0eae42f3f93cc97e
Signed-off-by: Aravinda VK <avishwan@redhat.com>
(cherry picked from commit da71bdcf82a8dc71a1170ad3f190702fa49d2838)
Reviewed-on: http://review.gluster.org/16008
Reviewed-by: Prashanth Pai <ppai@redhat.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>

0 files changed, 0 insertions, 0 deletions