[#729] Handle languages in URLs when updating page view tracking summary

Page view tracking was failing when a language was selected:

1. Put `ckan.tracking_enabled = true` in your ini file
2. Run CKAN, visit a page with a language e.g. `/en/dataset/annakarenina`
3. Run `paster tracking update`. If you look in your db, in the
   `tracking_summary` table there'll be a row with `package_id`
   `~~not~found~~`.
4. Run `paster tracking export tracking.csv`, the exported CSV file will
   say 0 views.

If you visit the page without the language in the URL e.g.
`/dataset/annakarenina` then run the export command again, the view does
get counted.

This commit fixes the SQL used by the `paster tracking update/export`
command to handle URLs with or without languages at the start.

Fixes #729

ckan/lib/cli.py

@@ -1047,7 +1047,7 @@ def export_tracking(self, engine, output_filename):
                               for r in total_views])
 
     def update_tracking(self, engine, summary_date):
-        PACKAGE_URL = '/dataset/'
+        PACKAGE_URL = '%/dataset/'
         # clear out existing data before adding new
         sql = '''DELETE FROM tracking_summary
                  WHERE tracking_date='%s'; ''' % summary_date
@@ -1073,7 +1073,7 @@ def update_tracking(self, engine, summary_date):
         sql = '''UPDATE tracking_summary t
                  SET package_id = COALESCE(
                         (SELECT id FROM package p
-                        WHERE t.url =  %s || p.name)
+                        WHERE t.url LIKE  %s || p.name)
                      ,'~~not~found~~')
                  WHERE t.package_id IS NULL
                  AND tracking_type = 'page';'''