feat: create exporters module (#364)

- upgrade node_exporter, bring managed under exporters module
- upgrade postgres_exporter, bring managed under exporters module
- add flag to cleanup previous iterations of exporters from prometheus module
- fix issues with vmclusster: replication + dedup

Reviewed-on: #364

hieradata/roles/infra/metrics/vminsert.yaml

@@ -4,7 +4,7 @@ hiera_include:
 
 vmcluster::vminsert::enable: true
 vmcluster::vminsert::options:
-  replicationFactor: '2'
+  replicationFactor: '5'
   httpListenAddr: ':8480'
   tls: 'true'
   tlsCertFile: '/etc/pki/tls/vault/certificate.crt'