Speed up deployment by reusing facts

The overcloud deployment playbook consists of several plays. Facts
gathered in a single playbook persist between plays, but by default
each play gathers facts from involved nodes before applying any
roles/tasks. That resulted in gathering facts many times.

This commit changes the deployment playbook so that we gather facts
once at the beginning, and then reuse them for subsequent plays.

Also any_errors_fatal is added to make sure that when one host fails,
subsequent tasks aren't attempted on the other hosts either.

Change-Id: I192ea99105bd188554d45a6e4290bb33d1f08ff1

common/deploy-steps.j2

@@ -348,8 +348,13 @@ outputs:
           params:
             BOOTSTRAP_SERVER_ID: {get_param: [servers, {{primary_role_name}}, '0']}
           template: |
+            - hosts: undercloud:overcloud
+              name: Gather facts
+              gather_facts: yes
             - hosts: overcloud
               name: Server deployments
+              gather_facts: no
+              any_errors_fatal: yes
               tasks:
 {%- for role in roles %}
                 - include: {{role.name}}/deployments.yaml
@@ -360,6 +365,8 @@ outputs:
 {%- endfor %}
             - hosts: overcloud
               name: Deployment steps
+              gather_facts: no
+              any_errors_fatal: yes
               vars:
                 bootstrap_server_id: BOOTSTRAP_SERVER_ID
               tasks:
@@ -370,12 +377,16 @@ outputs:
 {%- for step in range(1,deploy_steps_max) %}
             - hosts: undercloud
               name: Undercloud deployment step {{step}}
+              gather_facts: no
+              any_errors_fatal: yes
               vars:
                 step: '{{step}}'
               tasks:
                 - include: external_deploy_steps_tasks.yaml
             - hosts: overcloud
               name: Overcloud deployment step {{step}}
+              gather_facts: no
+              any_errors_fatal: yes
               vars:
                 bootstrap_server_id: BOOTSTRAP_SERVER_ID
                 step: '{{step}}'
@@ -384,6 +395,8 @@ outputs:
 {%- endfor %}
             - hosts: overcloud
               name: Server Post Deployments
+              gather_facts: no
+              any_errors_fatal: yes
               tasks:
 {%- for role in roles %}
                 - include: {{role.name}}/deployments.yaml