LDOMs on SPARC and Oracle VM Agent

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Failure to get working disk and network in a guest LDOM with messages like:

 communication error with virtual disk server using port 0 ...

or

WARNING: /virtual-devices@100/channel-devices@200/disk@0: Timeout
connecting to virtual disk server... retrying

or

WARNING: /virtual-devices@100/channel-devices@200/network@0: 
Communication error with Virtual Network Server!

A badly configured (or unconfigured?) Oracle VM Agent will terminate all network and disk traffic to guest LDOMs! There will be a README file in the root filesystem that explains how to correct this.