provider/azure: Allow settings_file to accept XML string

[catsby]

Update the Azure provider to accept XML data for the settings_file attribute.
Users should now use settings_file = "${file("path to file")}" in their configuration:

provider "azure" {
  settings_file = "${file("credentials.publishsettings")}"
}

Optionally, you can specify the XML inline:

provider "azure" {
  settings_file = <<EOF
<?xml version="1.0" encoding="utf-8"?>
<PublishData>
  <PublishProfile
    SchemaVersion="2.0"
    PublishMethod="AzureServiceManagementAPI">
    <Subscription
      ServiceManagementUrl="https://management.core.windows.net"
      Id="a65bf94f-*********"
      Name="Pay-As-You-Go"
      ManagementCertificate="*********"/>
  </PublishProfile>
</PublishData>
EOF
}

Requires Azure/azure-sdk-for-go#181 (which has been merged into their master branch, but hasn't yet been released as of 2015-08-03)

This is meant to be the Azure complement of #2839

[phinze]

Do we know that this is required? Why was it set as optional in the first place? Maybe there are weird alternative auth mechanisms like instance roles in AWS?

[catsby]

agh, that's actually a mistake I suppose, since you can do the file or the other two things. I was modeling off the Google one, thanks for pointing that out! Fixed in a7543de

[phinze]

One question - code LGTM!

[phinze]

Looks G2G! 🚀

[ghost]

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