ci: set replica count to 1 since we have a single osd

Signed-off-by: Sébastien Han <seb@redhat.com>
(cherry picked from commit 6e9da95b33)

tests/functional/centos/7/cluster/group_vars/all

@@ -15,3 +15,7 @@ os_tuning_params:
   - { name: fs.file-max, value: 26234859 }
 user_config: True
 openstack_config: True
+ceph_conf_overrides:
+  global:
+    osd_pool_default_pg_num: 8
+    osd_pool_default_size: 1

tests/functional/centos/7/dmcrypt-dedicated-journal/group_vars/all

@@ -12,3 +12,7 @@ raw_journal_devices:
 os_tuning_params:
   - { name: kernel.pid_max, value: 4194303 }
   - { name: fs.file-max, value: 26234859 }
+ceph_conf_overrides:
+  global:
+    osd_pool_default_pg_num: 8
+    osd_pool_default_size: 1

tests/functional/centos/7/dmcrypt-journal-collocation/group_vars/all

@@ -11,3 +11,7 @@ devices:
 os_tuning_params:
   - { name: kernel.pid_max, value: 4194303 }
   - { name: fs.file-max, value: 26234859 }
+ceph_conf_overrides:
+  global:
+    osd_pool_default_pg_num: 8
+    osd_pool_default_size: 1

tests/functional/ubuntu/16.04/cluster/group_vars/all

@@ -13,3 +13,7 @@ raw_multi_journal: True
 os_tuning_params:
   - { name: kernel.pid_max, value: 4194303 }
   - { name: fs.file-max, value: 26234859 }
+ceph_conf_overrides:
+  global:
+    osd_pool_default_pg_num: 8
+    osd_pool_default_size: 1