Add support for web-download import method

This change adds support for 'web-download' import method
to 'image-import' and 'create-image-via-import' call.
To use this 'web-download' import method, user needs to pass
--uri option 'a valid uri to external image to import in glance'
to 'image-import' and 'create-image-via-imaport' calls.

Co-authored-by: Pranali Deore <pdeore@redhat.com>
Co-authored-by: Erno Kuvaja <jokke@usr.fi>

Change-Id: I0e1d18844f64723608288de473e97710798eb602

glanceclient/tests/unit/v2/base.py

@@ -106,6 +106,10 @@ class BaseController(testtools.TestCase):
         resp = self.controller.deassociate(*args)
         self._assertRequestId(resp)
 
+    def image_import(self, *args):
+        resp = self.controller.image_import(*args)
+        self._assertRequestId(resp)
+
 
 class BaseResourceTypeController(BaseController):
     def __init__(self, api, schema_api, controller_class):