Fix the pip required packages variable name

The SNI changes that merged in
Idcf773e16d62d2ad76d9341177dd4d6c3e410af3 are not being picked up
by py_pkgs and the repo build process because the variable name
does not match the *_pip_packages format.

Change-Id: Iea9857870c498d70f501aaf7d3528aad5737418e

defaults/main.yml

@@ -35,7 +35,7 @@ pip_source_install_options: ""
 # wheel and any other packages which must be installed when pip installs.
 pip_packages: []
 
-pip_required_packages:
+pip_required_pip_packages:
   - pyOpenSSL # SSL SNI support
   - pyasn1 # SSL SNI support
   - ndg-httpsclient # SSL SNI support

tasks/install_binary.yml

@@ -37,7 +37,7 @@
 
 - name: Install required pip packages
   pip:
-    name: "{{ pip_packages | map('quote') | join (' ') }} {{ pip_required_packages | map('quote') | join(' ') }}"
+    name: "{{ pip_packages | map('quote') | join (' ') }} {{ pip_required_pip_packages | map('quote') | join(' ') }}"
     state: latest
     extra_args: "--upgrade --force-reinstall"
   register: install_packages

tasks/install_source.yml

@@ -18,7 +18,7 @@
     python /opt/get-pip.py {{ pip_source_install_options }} \
                            {{ pip_get_pip_options }} \
                            {{ pip_packages | map('quote') | join (' ') }} \
-                           {{ pip_required_packages | map('quote') | join(' ') }}
+                           {{ pip_required_pip_packages | map('quote') | join(' ') }}
   ignore_errors: true
   register: pip_install
   until: pip_install | success
@@ -30,7 +30,7 @@
     python /opt/get-pip.py --isolated {{ pip_source_install_options }} \
                                       {{ pip_get_pip_options }} \
                                       {{ pip_packages | map('quote') | join (' ') }} \
-                                      {{ pip_required_packages | map('quote') | join(' ') }}
+                                      {{ pip_required_pip_packages | map('quote') | join(' ') }}
   when: pip_install.rc != 0
   register: pip_install_fall_back
   until: pip_install_fall_back | success