IP Address Showing as JSON in Show Command

changes the 'ip' value returned in trove-show from a json array to
a string of comma separated values

before:

+----------+--------------------------------------+
| Property |                Value                 |
+----------+--------------------------------------+
| created  |         2013-10-23T06:49:55          |
|  flavor  |                  9                   |
|    id    | 95f6bc02-0d84-46e1-83e6-db7f3f064677 |
|    ip    |            [u'10.0.0.2']             |
|   name   |               TestTest               |
|  status  |                ACTIVE                |
| updated  |         2013-10-23T06:49:58          |
|  volume  |                  5                   |
+----------+--------------------------------------+

after:

+----------+--------------------------------------+
| Property |                Value                 |
+----------+--------------------------------------+
| created  |         2013-10-23T06:49:55          |
|  flavor  |                  9                   |
|    id    | 95f6bc02-0d84-46e1-83e6-db7f3f064677 |
|    ip    |               10.0.0.2               |
|   name   |               TestTest               |
|  status  |                ACTIVE                |
| updated  |         2013-10-23T06:49:58          |
|  volume  |                  5                   |
+----------+--------------------------------------+

Change-Id: I56f2a6dea90dcfa790abb8592f565372ad616a1b
Closes-Bug: 1245608
Merge "IP Address Showing as JSON in Show Command"