Slurp constraints for all hosts

This fixes bug when content slurp has been performed only for single
host. Others were having invalid contstraints file with single record
in it.

Change-Id: I7189e061f6c8ab3dfb69dda6a9e7f974f8bdc06b

tasks/python_venv_install.yml

@@ -13,6 +13,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Slurp up the constraints file for later re-deployment
+  delegate_to: "{{ venv_build_host }}"
+  become: "{{ venv_build_host == 'localhost' }}"
+  slurp:
+    src: "{{ venv_build_host_requirements_path }}/{{ venv_install_destination_path | basename }}-constraints.txt"
+  register: _constraints_file_slurp
+  run_once: true
+  when: venv_wheel_build_enable | bool
+
 # TODO(odyssey4me):
 # Set a fact for the selective inclusion of the build package list.
 # Perhaps do this if the distro/architecture of the target host differs

tasks/python_venv_wheel_build.yml

@@ -157,10 +157,3 @@
               {{ file_name.split('-')[0] | lower }}=={{ (file_name.split('-')[1].split('_')) | join('.post') | lower }}
               {% endfor %}
             dest: "{{ venv_build_host_requirements_path }}/{{ venv_install_destination_path | basename }}-constraints.txt"
-
-    - name: Slurp up the constraints file for later re-deployment
-      slurp:
-        src: "{{ venv_build_host_requirements_path }}/{{ venv_install_destination_path | basename }}-constraints.txt"
-      register: _constraints_file_slurp
-      tags:
-        - install