Print share export locations more pretty
Print share export locations more pretty

Manila provides two fields with export locations:
- 'export_location' (deprecated)
- 'export_locations' (introduced in Kilo-3)

So, remove the former from output if the latter exist and transform the latter
to text from list with 'newline' separators. It will make output more pretty:

+-------------------+--------------------------------------------+
| Property          | Value                                      |
+-------------------+--------------------------------------------+
| status            | available                                  |
| export_locations  | 1.2.3.4:/f/o/o                             |
|                   | 5.6.7.8:/b/a/r                             |
|                   | 9.10.11.12:/q/u/u/z                        |
| id                | d778d2ee-b6bb-4c5f-9f5d-6f3057d549b1       |
| size              | 1                                          |
| share_proto       | NFS                                        |
+-------------------+--------------------------------------------+

Change-Id: Ic1e5ae194821afa0680f3c53b5000d7e22bbfa00

sniperganso/python-manilaclient,sniperganso/python-manilaclient