Run tox by module name (python -m tox)

Change-Id: Iafb1d3efe6d44d58f2c8bf7f72026b4873d725d9

roles/tests/test_infrared_plugin.yaml

@@ -38,7 +38,7 @@
     - name: "run Tox InfraRed plugin"
       shell:
         cmd: >
-          '{{ tox_executable }}' -e infrared -- --collect-dir '{{ test_collect_dir }}'
+          {{ tox_executable }} -e infrared -- --collect-dir '{{ test_collect_dir }}'
         chdir: '{{ test_dir }}'
       ignore_errors: yes
       register: run_tox

roles/tobiko-ensure-tox/tasks/tox.yaml

@@ -1,39 +1,23 @@
 ---
 
 - name: "ensure Tox is installed"
-  command: |
-    '{{ python_executable }}' -m pip install --user 'tox>={{ tox_min_version }}'
+  command: >
+    {{ python_executable }} -m pip install --user 'tox>={{ tox_min_version }}'
   register: install_tox
   changed_when: "'Successfully installed' in install_tox.stdout"
 
-
-- block:
-    - name: "get '{{ tox_command }}' full path"
-      shell: |
-        export PATH={{ python_exe_path }}
-        which '{{ tox_command }}'
-      register: get_tox_path
-
-    - name: "set tox_executable fact"
-      set_fact:
-        tox_executable: '{{ get_tox_path.stdout_lines | first }}'
-
-  rescue:
-    - name: "set tox_executable fact"
-      set_fact:
-        tox_executable: '{{ ansible_user_dir }}/.local/bin/tox'
-
+- name: "set tox_executable fact"
+  set_fact:
+    tox_executable: "{{ python_executable }} -m tox"
 
 - name: "get installed Tox version"
-  command: "'{{ tox_executable }}' --version"
+  command: "{{ tox_executable }} --version"
   register: get_tox_version
 
-
 - name: "update tox_version fact"
   set_fact:
     tox_version: '{{ get_tox_version.stdout_lines | first }}'
 
-
 - name: "show Tox facts"
   debug:
     msg: