Adding '--wrap' functionality to Magnum Client

[M V P Nitesh]

When cluster creation is failed and when we do "magnum cluster-show <cluster-id/cluster-name>" the output is not in a readable format. Will wrap the output, by adding '--wrap' as an argument in all show commands of magnum.

Eg:
:~$ magnum cluster-show swarm-cluster
+---------------------+-------------------------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------+
| Property | Value

                                                                             |
+---------------------+-------------------------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------+
| status | CREATE_FAILED

                                                                             |
| cluster_template_id | 6e39806e-3666-4021-a168-af97395ebae6

                                                                             |
| node_addresses | []

                                                                             |
| docker_volume_size | -

                                                                             |
| stack_id | fa211270-9464-4577-85b5-692b53c691f1

                                                                             |
| status_reason | Resource CREATE failed: WaitConditionFailure: resources.swarm_masters.resources[0].resources.master_wait_condition: swarm-manager service failed
 to start.
                                                                             | [1616/1825]
| created_at | 2017-08-02T13:21:23+00:00

                                                                             |
| name | swarm-cluster

                                                                             |
| updated_at | 2017-08-02T13:23:43+00:00

                                                                             |
| coe_version | 1.2.5

                                                                             |
| faults | {'swarm_masters': 'WaitConditionFailure: resources.swarm_masters.resources[0].resources.master_wait_condition: swarm-manager service failed to s
tart.', 'master_wait_condition': 'WaitConditionFailure: resources.master_wait_condition: swarm-manager service failed to start.', '0': 'WaitConditionFailure: resources[
0].resources.master_wait_condition: swarm-manager service failed to start.'} |
| keypair | mykey

                                                                             |
| api_address | tcp://:2376

                                                                             |
| master_addresses | ['172.24.4.6']

                                                                             |
| create_timeout | 60

                                                                             |
| node_count | 2

                                                                             |
| discovery_url | https://discovery.etcd.io/9363bea7811c3e3091de3e0223035d47

                                                                             |
| master_count | 1

                                                                             |
| container_version | 1.12.6

                                                                             |
| uuid | ea00daf6-adbb-4d35-b3ea-ba9599cfe1d9

                                                                             |
+---------------------+-------------------------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------+

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/493523