[python-fuelclient] More verbosity should be added to the output of commands that operating on vms instead 'not found'

[Vitalii Kulanov]

Detailed bug description:
In python-fuelclient there is a set of commands that operate on vms (https://github.com/openstack/python-fuelclient/commit/6e24282c7a7faa6c67f6a97aae78431bb5c4c414). But the API and respective fuel2 commands are only available if 'advanced' feature is setted in 'feature_group' (from fuelmenu). In other case Nailgun reports '(not found)'. It's worth to check 'advanced' flag before executing command and give more user-friendly error message instead '(not found)' one.

Steps to reproduce:
1. Deploy Fuel (e.g. 1 master + 5 nodes).
2. Create some environment.
3. Add several nodes to environment.
4. Try to create vms config in metadata for any selected node:
   [root@fuel ~]# fuel2 node create-vms-conf 1 --conf 'SOME_CONFIG_DATA'
   404 Client Error: Not Found for url: http://10.20.0.2:8000/api/v1/nodes/1/vms_conf/ (not found)

The same result will be for the rest fuel2 commands that operate on vms

Expected results:
   Advanced feature should be enabled in feature groups

Actual result:
   404 Client Error: Not Found for url: http://10.20.0.2:8000/api/v1/nodes/1/vms_conf/ (not found)

Description of the environment:
[root@fuel ~]# shotgun2 short-report
cat /etc/fuel_build_id:
 410
cat /etc/fuel_build_number:
 410
cat /etc/fuel_release:
 10.0
cat /etc/fuel_openstack_version:
 newton-10.0

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/343619

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/343619
Committed: https://git.openstack.org/cgit/openstack/python-fuelclient/commit/?id=8b5dcd4d8ee560884fdf903135bee99e3c845792
Submitter: Jenkins
Branch: master

commit 8b5dcd4d8ee560884fdf903135bee99e3c845792
Author: tivaliy <email address hidden>
Date: Mon Jul 18 15:33:34 2016 +0300

    Add more verbosity to fuel2 vms commands

    There is a set of commands that operate on vms.
    But the API and respective fuel2 commands are
    only available if 'advanced' feature is active
    in 'feature_group' (from fuelmenu). In other case
    Nailgun reports '(not found)'. This patch adds more
    verbosity to fuel2 vms commands if 'advanced' feature
    is not active instead '(not found)' responce.

    Change-Id: Idc1a2612ca20125ed54bdd35bfb048a81fa22cdd
    Closes-Bug: 1603980