Hi gouthamr carloss_ 
For the bug: https://bugs.launchpad.net/python-manilaclient/+bug/1782847

Are these behaviours correct?

1. list --metadata key=value
GET: /shares/detail?metadata={'key': 'value'}

2. list --metadata key1=value1 key2=value2 key3=value3
GET: shares/detail?metadata={'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}

3. list --metadata ''
GET: /shares/detail

4. list --metadata key=value ''
GET: shares/detail?metadata={'key': 'value'}

5. list --metadata key
GET: /shares/detail?metadata={'key': None}

6. list --metadata
GET: /shares/detail