Support musicprovider endpoints

[gmuth]

/streaming/sourceproviders lists music providers. music endpoints seem to handle account integration with those providers:

POST /streaming/music/musicprovider/26/is_eligible

<?xml version = "1.0" encoding = "utf-8"?>
<account>
  <accountId></accountId>
</account>

returns

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<eligibility>
  <isEligible>false</isEligible>
</eligibility>

POST /streaming/music/musicprovider/14/trial/is_eligible

content-type: application/vnd.bose.streaming-v1.1+xml
version_protocolversion: 67

<?xml version = "1.0" encoding = "utf-8"?>
<account>
  <accountId>123456</accountId>
</account>

returns

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<eligibility>
  <isEligible>false</isEligible>
</eligibility>