Remove _min_microversion for consistency

This is a minor update for change
I249b293b11a0e57ddf685de284681f060a334c1c in order
to keep consistency.

Change-Id: I3bfe3efb8260c08f5f81cd0487afefe0dd439c94

openstack/shared_file_system/v2/share_export_locations.py

@@ -28,7 +28,6 @@ class ShareExportLocation(resource.Resource):
     allow_head = False
 
     _max_microversion = '2.47'
-    _min_microversion = '2.9'
 
     #: Properties
     # The share ID, part of the URI for export locations