Merge pull request #2050 from edx/feanil/fix_stage_certs

Install requirements after we checkout the code.

playbooks/edx-east/legacy_certificates.yml

@@ -21,6 +21,11 @@
         accept_hostkey=yes
       environment:
         GIT_SSH: "{{ git_ssh_script }}"
+    - name: install requirements
+      pip:
+        requirements: "{{ repo_path }}/requirements.txt"
+        virtualenv: "/opt/edx"
+        state: present
     # Need to do this because the www-data user is not properly setup
     # and can't run ssh.
     - name: change owner to www-data