share_network_subnets not parsed properly in "openstack share network show"

[Morozov Aleksey]

When create a share network with the command:
openstack share network create --neutron-net-id <neutron-net-id> --neutron-subnet-id <neutron-subnet-id> --name share-network
You get output:
`share_network_subnets`
instead of table with chars. The same thing happens when calling the show function. This is due to the absence of the key "share_network_subnets" in the share_network._info. For fix this you need to add check like this in create and show functions:
```python
share_network_data = share_network._info
if 'share_network_subnets' not in share_network_data:
   share_network_data['share_network_subnets'] = []
```

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/python-manilaclient/+/919758
Committed: https://opendev.org/openstack/python-manilaclient/commit/48fbad6f62e13accd99225d92007cd2eb2a47833
Submitter: "Zuul (22348)"
Branch: master

commit 48fbad6f62e13accd99225d92007cd2eb2a47833
Author: morozovalekseywot <email address hidden>
Date: Wed May 15 20:13:38 2024 +0300

    Fix show info about share network

    Add check for _info dict, without this check an exception will occur and user doesn't get info.

    Closes-Bug:#2065771
    Change-Id: I0b0dba95c53aad264921dc32644ee8e5b86fc1e2