Correct Bodhi's wiki URLs for staging.

To do this, I added an env_prefix variable - sometimes you need to
be able to say "stg." instead of ".stg" (env_suffix), and this is
an example.

Signed-off-by: Randy Barlow <randy@electronsweatshop.com>

inventory/group_vars/all

@@ -217,6 +217,7 @@ nrpe_check_postfix_queue_crit: 5
 
 # env is staging or production, we default it to production here.
 env: production
+env_prefix:
 env_suffix:
 env_short: prod
 

inventory/group_vars/staging

@@ -1,6 +1,7 @@
 ---
 freezes: false
 env: staging
+env_prefix: stg.
 env_suffix: .stg
 env_short: stg
 host_group: staging

roles/bodhi2/base/templates/production.ini.j2

@@ -103,8 +103,8 @@ datagrepper_url = https://apps{{env_suffix}}.fedoraproject.org/datagrepper
 query_wiki_test_cases = True
 # wiki_url = https://fedoraproject.org/w/api.php
 # test_case_base_url = https://fedoraproject.org/wiki/
-wiki_url = https://{{env_suffix}}fedoraproject.org/w/api.php
-test_case_base_url = https://{{env_suffix}}fedoraproject.org/wiki/
+wiki_url = https://{{env_prefix}}fedoraproject.org/w/api.php
+test_case_base_url = https://{{env_prefix}}fedoraproject.org/wiki/
 
 # URL of the resultsdb for integrating checks and stuff
 # resultsdb_api_url = https://taskotron.fedoraproject.org/resultsdb_api/