Replace occurences of '/' in nodename to something more path friendly

Inventory hostnames like "abc/123" is valid in both ansible and zuul
but this role breaks since it uses it as part of a path. This sanitizes
the hostname from "abc/123" to "abc_123".

Change-Id: Ic89d595b6f004b5ca4805f1af8387e8ba56564aa

roles/validate-host/defaults/main.yaml

@@ -1,3 +1,4 @@
 zuul_site_image_manifest_files:
   - /etc/dib-builddate.txt
   - /etc/image-hostname.txt
+validate_host_hostname:  "{{ inventory_hostname }}"

roles/validate-host/tasks/main.yaml

@@ -13,10 +13,14 @@
   setup:
   register: setupinfo
 
+- name: Sanitize hostname
+  set_fact:
+    validate_host_hostname_sanitized: "{{ validate_host_hostname | replace('/', '_') }}"
+
 - name: Write out all ansible variables/facts known for each host
   delegate_to: localhost
   template:
-    dest: "{{ zuul_info_dir }}/host-info.{{ inventory_hostname }}.yaml"
+    dest: "{{ zuul_info_dir }}/host-info.{{ validate_host_hostname_sanitized }}.yaml"
     src: templates/host-info.j2
 
 - name: zuul_debug_info block
@@ -31,7 +35,7 @@
     - name: Write out all zuul information for each host
       delegate_to: localhost
       template:
-        dest: "{{ zuul_info_dir }}/zuul-info.{{ inventory_hostname }}.txt"
+        dest: "{{ zuul_info_dir }}/zuul-info.{{ validate_host_hostname_sanitized }}.txt"
         src: templates/zuul-info.j2
 
   when: ansible_python_version is version('2.7', '>=')

test-playbooks/base-roles/validate-host.yaml

@@ -11,3 +11,4 @@
   roles:
     - role: validate-host
       zuul_site_traceroute_host: files.openstack.org
+      validate_host_hostname: "abc/123"