tests: make centos7_cluster use three mons

Signed-off-by: Andrew Schoen <aschoen@redhat.com>

tests/functional/centos/7/cluster/hosts

@@ -1,5 +1,7 @@
 [mons]
-mon0 monitor_interface=eth1
+mon0 monitor_address=192.168.1.10
+mon1 monitor_interface=eth1
+mon2 monitor_address=192.168.1.12
 
 [osds]
 osd0

tests/functional/centos/7/cluster/scenario.py

@@ -1,7 +1,8 @@
 # Basic information about ceph and its configuration
 ceph = {
     'releases': ['infernalis', 'jewel'],
-    'cluster_name': 'ceph'
+    'cluster_name': 'ceph',
+    'subnet': '192.168.1',
 }
 
 # remote nodes to test, with anything specific to them that might be useful for
@@ -10,7 +11,15 @@ ceph = {
 nodes = {
     'mon0': {
         'username': 'vagrant',
-        'components': ['mon', 'mon_initial_members']
+        'components': ['conf_tests']
+    },
+    'mon1': {
+        'username': 'vagrant',
+        'components': ['conf_tests']
+    },
+    'mon2': {
+        'username': 'vagrant',
+        'components': ['conf_tests']
     },
     'osd0': {
         'username': 'vagrant',

tests/functional/centos/7/cluster/vagrant_variables.yml

@@ -4,7 +4,7 @@
 docker: false
 
 # DEFINE THE NUMBER OF VMS TO RUN
-mon_vms: 1
+mon_vms: 3
 osd_vms: 1
 mds_vms: 1
 rgw_vms: 1