Allow bindep role to read from more then one bindep file

Extend bindep role to be able to install packages from
multiple paths at once. This behavior is fully compatible
with current implementation, however it allows to pass
number of bindep file paths.

Change-Id: I70d42f25837ff282aad534f9ead965d12858ac9b

roles/bindep/README.rst

@@ -19,7 +19,7 @@ then install the missing packages.
 
 .. zuul:rolevar:: bindep_file
 
-   Path to a specific bindep file to read from.
+   Path or list of paths to a specific bindep file(s) to read from.
 
 .. zuul:rolevar:: bindep_command
 

roles/bindep/tasks/main.yaml

@@ -10,10 +10,13 @@
     - bindep_file is defined
     - bindep_command is not defined
 
-- name: Define bindep_run fact
+- name: Convert bindep_file to list
   set_fact:
-    bindep_run: "{{ bindep_command }} -b -f {{ bindep_file }} {{ bindep_profile }}"
-  when: bindep_file is defined
+    bindep_file: "{{ [bindep_file] }}"
+  when: bindep_file is defined and bindep_file is string
 
 - include_tasks: packages.yaml
+  loop: "{{ bindep_file }}"
+  loop_control:
+    loop_var: zj_bindep_file
   when: bindep_file is defined

roles/bindep/tasks/packages.yaml

@@ -1,3 +1,7 @@
+- name: Define bindep_run fact
+  set_fact:
+    bindep_run: "{{ bindep_command }} -b -f {{ zj_bindep_file }} {{ bindep_profile }}"
+
 - name: Get list of packages to install from bindep
   command: "{{ bindep_run }}"
   register: bindep_output
@@ -21,5 +25,5 @@
 
 - name: Fail if we cannot install all packages
   fail:
-    msg: "bindep failed to install from {{ bindep_file }} - {{ bindep_final_check.stdout }}"
+    msg: "bindep failed to install from {{ zj_bindep_file }} - {{ bindep_final_check.stdout }}"
   when: bindep_final_check is failed