Execute the precheck stage of the selected patch on a host and return its output

Return value
	type	description
	string	the output of the patch prechecks
Parameters
name	type	description
session_id	session	valid session reference
self	pool_patch	The patch whose prechecks will be run
host	host	The host to run the prechecks on
Errors
name	arguments	description

• Message has both a synchronous and asynchronous version
• This is a custom message