Remove --use-mirrors option for pip

PyPI is using a CDN now and the PyPI mirror infrastructure is
officially deprecated.

playbooks/roles/edxapp/tasks/deploy.yml

@@ -129,7 +129,7 @@
   # requirements are pathed relative to the edx-platform repo. Using the pip from inside the virtual environment implicitly
   # installs everything into that virtual environment.
   shell: >
-    {{ edxapp_venv_dir }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w --use-mirrors -r {{ base_requirements_file }}
+    {{ edxapp_venv_dir }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w -r {{ base_requirements_file }}
     chdir={{ edxapp_code_dir }}
   environment: "{{ edxapp_environment }}"
   sudo_user: "{{ edxapp_user }}"
@@ -181,7 +181,7 @@
   # requirements are pathed relative to the edx-platform repo. Using the pip from inside the virtual environment implicitly
   # installs everything into that virtual environment.
   shell: >
-    {{ edxapp_venv_dir }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w --use-mirrors -r {{ item }}
+    {{ edxapp_venv_dir }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w -r {{ item }}
     chdir={{ edxapp_code_dir }}
   with_items:
   - "{{ github_requirements_file }}"
@@ -195,7 +195,7 @@
   # requirements are pathed relative to the edx-platform repo. Using the pip from inside the virtual environment implicitly
   # installs everything into that virtual environment.
   shell: >
-    {{ edxapp_venv_dir }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w --use-mirrors -r {{ item }}
+    {{ edxapp_venv_dir }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w -r {{ item }}
     chdir={{ edxapp_code_dir }}
   with_items:
   - "{{ private_requirements_file }}"
@@ -209,7 +209,7 @@
   pip: >
     name="{{ item.name }}"
     version="{{ item.version|default(omit) }}"
-    extra_args="--exists-action w --use-mirrors {{ item.extra_args|default('') }}"
+    extra_args="--exists-action w {{ item.extra_args|default('') }}"
     virtualenv="{{ edxapp_venv_dir }}"
     state=present
   with_items: EDXAPP_EXTRA_REQUIREMENTS
@@ -222,7 +222,7 @@
     name="{{ EDXAPP_CAS_ATTRIBUTE_PACKAGE }}"
     virtualenv="{{ edxapp_venv_dir }}"
     state=present
-    extra_args="-i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w --use-mirrors"
+    extra_args="-i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w"
   sudo_user: "{{ edxapp_user }}"
   when: EDXAPP_CAS_ATTRIBUTE_PACKAGE|length > 0
 
@@ -232,7 +232,7 @@
   # requirements are pathed relative to the edx-platform repo. Using the pip from inside the virtual environment implicitly
   # installs everything into that virtual environment.
   shell: >
-    {{ edxapp_venv_dir }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w --use-mirrors -r {{ item }}
+    {{ edxapp_venv_dir }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w -r {{ item }}
     chdir={{ edxapp_code_dir }}
   with_items:
   - "{{ sandbox_base_requirements }}"
@@ -256,7 +256,7 @@
     requirements="{{ sandbox_base_requirements }}"
     virtualenv="{{ edxapp_sandbox_venv_dir }}"
     state=present
-    extra_args="-i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w --use-mirrors"
+    extra_args="-i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w"
   sudo_user: "{{ edxapp_sandbox_user }}"
   when: EDXAPP_PYTHON_SANDBOX
   tags:
@@ -264,7 +264,7 @@
 
 - name: code sandbox | Install sandbox requirements into sandbox venv
   shell: >
-    {{ edxapp_sandbox_venv_dir }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w --use-mirrors -r {{ item }}
+    {{ edxapp_sandbox_venv_dir }}/bin/pip install -i {{ COMMON_PYPI_MIRROR_URL }} --exists-action w -r {{ item }}
     chdir={{ edxapp_code_dir }}
   with_items:
   - "{{ sandbox_local_requirements }}"