OSTF-210: Review comments applied.
1. -w 1 param was added to ping command
	to reduce the time of waiting
2. Error code check was added to ping command
	verification instead of parsing the answer.
3. Comment about self.host cannot be applied because
	this code fragment looks like very obsolete
	(changed at bcc01fb87ab9b182ffac362a3e4b0357ec75700d
	commit, JUL-26)