Add role to ensure bindep is installed on target host

Change-Id: I428e1e4b5f1c6be0de428c97b2206b288326c463

roles/tobiko-ensure-bindep/defaults/main.yaml

@@ -0,0 +1,4 @@
+---
+
+bindep_executable: bindep
+bindep_min_version: 2.8

roles/tobiko-ensure-bindep/meta/main.yaml

@@ -0,0 +1,5 @@
+---
+
+dependencies:
+  - role: tobiko-common
+  - role: tobiko-ensure-python

roles/tobiko-ensure-bindep/tasks/main.yaml

@@ -0,0 +1,23 @@
+---
+
+- name: "ensure Bindep is installed"
+  command: |
+    '{{ python_executable }}' -m pip install --user 'bindep>={{ bindep_min_version }}'
+  register: result
+  changed_when: "'Successfully installed' in result.stdout"
+
+
+- name: "set bindep_executable fact"
+  set_fact:
+    bindep_executable: "{{ ansible_user_dir }}/.local/bin/bindep"
+    cacheable: true
+  when: result is changed
+
+
+- name: "get installed Bindep version"
+  command: "{{ bindep_executable }} --version"
+  register: get_installed_bindep_version
+
+
+- name: "show Bindep installed version"
+  debug: var=get_installed_bindep_version.stdout_lines