Add assert statements for Volume Pagination test to get passed

In the endpoint for http and https, Keystone has explicit
port number.

So, added assert statements by using urlparse for parsing the
hostname, path and scheme of the url.

Related-prod: PRODX-1102
Change-Id: I38d875c36ba72fd49f9e9f6fbd9ca3160f4821a6
Closes-Bug: #1838530
diff --git a/tempest/api/volume/test_volumes_list.py b/tempest/api/volume/test_volumes_list.py
index d5358ab..2345698 100644
--- a/tempest/api/volume/test_volumes_list.py
+++ b/tempest/api/volume/test_volumes_list.py
@@ -17,7 +17,7 @@
 import operator
 import random
 
-from six.moves.urllib import parse
+from six.moves.urllib.parse import urlparse
 from testtools import matchers
 
 from tempest.api.volume import base
@@ -333,7 +333,19 @@
             # If the current iteration is from a 'next' link, check that the
             # absolute url is the same as the one used for this request
             if next:
-                self.assertEqual(next, response.response['content-location'])
+                curr = response.response['content-location']
+                currparsed = urlparse(curr)
+                nextparsed = urlparse(next)
+                # Depending on the environment, certain fields are omitted
+                # from url (ie port). The fields to check are defined here.
+                fieldscheck = ['scheme', 'hostname', 'path', 'query', 'params',
+                               'fragment']
+                for field in fieldscheck:
+                    self.assertEqual(getattr(currparsed, field),
+                                     getattr(nextparsed, field),
+                                     'Incorrect link to next page. URLs do '
+                                     'not match at %s:\n%s\n%s' % (field, curr,
+                                                                   next))
 
             # Get next from response
             next = None
@@ -352,7 +364,7 @@
             # If we can follow to the next page, get params from url to make
             # request in the form of a relative URL
             if next:
-                params = parse.urlparse(next).query
+                params = urlparse(next).query
 
             # If cannot follow make sure it's because we have finished
             else: