Don't delete .pyc files for space. Sandboxes need them.

playbooks/roles/edx_ansible/templates/pre-box.j2

@@ -13,8 +13,9 @@ apt-get autoclean -y
 # Clean out pip caches.
 find / -type d -path '*/.cache/pip' -print -exec rm -rf '{}/*' \;
 
-# Remove all the .pyc files.
-find /edx/app -name '*.pyc' -delete
+# We used to remove all .pyc files. This caused problems in sandboxes,
+# where code couldn't write .pyc files, and everything took too long.
+#   find /edx/app -name '*.pyc' -delete
 
 # Last thing: fill the disk with zeros so they'll compress well.
 # The dd command fails because the disk fills, which is the point, so silence