Use the ubuntu keyserver to retrieve the edX PPA key.

We already do this in the common role but not in bootstrap or abbey roles.

util/install/ansible-bootstrap.sh

@@ -48,7 +48,7 @@ PYTHON_BIN="${VIRTUAL_ENV}/bin"
 ANSIBLE_DIR="/tmp/ansible"
 CONFIGURATION_DIR="/tmp/configuration"
 EDX_PPA="deb http://ppa.edx.org precise main"
-EDX_PPA_KEY_SERVER="hkp://pgp.mit.edu:80"
+EDX_PPA_KEY_SERVER="keyserver.ubuntu.com"
 EDX_PPA_KEY_ID="B41E5E3969464050"
 
 cat << EOF

util/vpc-tools/abbey.py

@@ -331,7 +331,7 @@ VIRTUAL_ENV_VERSION="15.0.2"
 PIP_VERSION="8.1.2"
 SETUPTOOLS_VERSION="24.0.3"
 EDX_PPA="deb http://ppa.edx.org precise main"
-EDX_PPA_KEY_SERVER="hkp://pgp.mit.edu:80"
+EDX_PPA_KEY_SERVER="keyserver.ubuntu.com"
 EDX_PPA_KEY_ID="B41E5E3969464050"
 
 cat << EOF