Update circle.yml for Ubuntu 14.04

Change the owner of "$HOME/.bashrc.backup" as the Google cloud cli wants
to backup to this file during setup and it's owned by root in the Circle
CI image.

Second, allow writes to `/usr/local/go/pkg` for `go install net` to
work.

circle.yml

@@ -22,6 +22,8 @@ dependencies:
     - |
       sudo apt-get update &&
       sudo apt-get install jq pv &&
+      sudo chmod a+wr --recursive /usr/local/go/pkg &&
+      sudo chown ubuntu:ubuntu "$HOME/.bashrc.backup"
       (curl https://sdk.cloud.google.com | bash) &&
       (test -z "$SECRET_PASSWORD" || bin/setup-circleci-secrets "$SECRET_PASSWORD") &&
       make deps &&