deploy: remove hot-standby server

When updating the hosts, the differences between configuring
hot-standby on postgresql 9.5 -> 16 are just too great.
I think the hot-standby feature was of questionable value
anyway, and it super-complicates the update procedure, and
shaman is due for some major architectural changes soon
anyway.

If this horribly affects performance we can circle back,
but I very much doubt it will.

Signed-off-by: Dan Mick <dan.mick@redhat.com>

Author: dmick

deploy/playbooks/roles/common/templates/prod_db.py.j2

@@ -9,7 +9,7 @@ sqlalchemy_w = {
 }
 
 sqlalchemy_ro = {
-    'url': 'postgresql+psycopg2://{{ app_name }}:{{ postgresql_app_user_password }}@{{ standby_ip }}/{{ app_name }}',
+    'url': 'postgresql+psycopg2://{{ app_name }}:{{ postgresql_app_user_password }}@{{ master_ip }}/{{ app_name }}',
     'echo':          False,
     'echo_pool':     False,
     'pool_recycle':  3600,

deploy/playbooks/roles/postgresql/tasks/main.yml

@@ -22,6 +22,3 @@
   when: "'postgresql_master' in group_names"
   become_user: postgres
   become: true
-
-- import_tasks: standby.yml
-  when: "'postgresql_standby' in group_names"

deploy/playbooks/roles/postgresql/templates/postgresql.conf.j2

@@ -679,6 +679,7 @@ xmlbinary = '{{ postgresql_cfg_xmlbinary }}'
 xmloption = '{{ postgresql_cfg_xmloption }}'
 {% endif %}
 
+
 #------------------------------------------------------------------------------
 # CUSTOMIZED OPTIONS
 #------------------------------------------------------------------------------