Try using name and not ip and see if that makes any difference.

inventory/host_vars/copr-be-dev2.cloud.fedoraproject.org

@@ -3,13 +3,13 @@ instance_type: m1.xlarge
 flavor_id: 2
 # image: "{{ f20_qcow_id }}"
 image: "86422ca2-6eeb-435c-87e8-402b3c7c3b7b"
-keypair: fas
+keypair: "fedora-admin-20130801"
 security_group: ssh-anywhere-coprdev,default
 OS_TENANT_ID: "566a072fb1694950998ad191fee3833b"
 OS_TENANT_NAME: "coprdev"
 zone: nova
 hostbase: copr-be-dev2-
-public_ip: 209.132.184.46
+public_ip: 209.132.184.49
 root_auth_users:  bkabrda msuchy tradej pingou vgologuz
 description: copr dispatcher and repo server - dev instance
 tcp_ports: ['22', '80', '443']

inventory/inventory

@@ -816,7 +816,6 @@ copr-fe-dev.cloud.fedoraproject.org
 [copr-back-stg]
 copr-be-dev.cloud.fedoraproject.org
 copr-be-dev2.cloud.fedoraproject.org
-209.132.184.49
 
 [copr-keygen-stg]
 209.132.184.124

playbooks/groups/copr-backend.yml

@@ -1,5 +1,5 @@
 - name: check/create instance
-  hosts: 209.132.184.49
+  hosts: copr-be-dev2.cloud.fedoraproject.org
   #hosts: copr-be-dev2.cloud.fedoraproject.org
   #hosts: copr-back:copr-back-stg
   #hosts: copr-back-stg
@@ -32,7 +32,7 @@
   - debug: msg="root auth users {{root_auth_users}}"
 
 - name: cloud basic setup
-  hosts: 209.132.184.49
+  hosts: copr-be-dev2.cloud.fedoraproject.org
   #hosts: copr-be-dev2.cloud.fedoraproject.org
   #hosts: copr-back:copr-back-stg
   #hosts: copr-back-stg
@@ -49,7 +49,7 @@
   - include: "{{ tasks }}/cloud_setup_basic.yml"
 
 - name: provision instance
-  hosts: 209.132.184.49
+  hosts: copr-be-dev2.cloud.fedoraproject.org
   #hosts: copr-be-dev2.cloud.fedoraproject.org
   #hosts: copr-back:copr-back-stg
   #hosts: copr-back-stg