Read the bucket name from configuration in CF template

[sebdah]

Read the bucket name from configuration in CF template.

"/etc/cumulus/metadata.conf" : {
  "content" : { "Fn::Join" : ["", [
    "[metadata]\n",
    "aws_access_key_id: ", { "Ref" : "WebServerKeys" }, "\n",
    "aws_secret_access_key: ", {"Fn::GetAtt": ["WebServerKeys", "SecretAccessKey"]}, "\n",
    "region: ", {"Ref" : "AWS::Region"}, "\n",
    "s3_bundles_bucket: se.skymill.bundles\n",
    "stack: ", { "Ref" : "AWS::StackName" }, "\n",
    "bundle_type: webserver\n",
    "version: ", { "Ref" : "Version" }, "\n"
  ]]},
  "mode"  : "000644",
  "owner" : "root",
  "group" : "root"
},