Create a new PBD instance, and return its handle.

Return value
	type	description
	PBD	reference to the newly created object
Parameters
name	type	description
session_id	session	valid session reference
host	host	physical machine on which the pbd is available
SR	SR	the storage repository that the pbd realises
device_config	Map[string,string]	a config string to string map that is provided to the host's SR-backend-driver
other_config	Map[string,string]	additional configuration
Errors
name	arguments	description

• Message has both a synchronous and asynchronous version
• This is an implicit message, derived from its class