Closes-Bug: #1363325
Issue: recursive tasks called for same storage nodes again
       caused the installation failure
Fix: env.host_string is used to avoid recursive task call

Change-Id: I910ef8d4251ff22a2126bf976a3ec1c1ec34372a
Merge "Closes-Bug: #1363325 Issue: recursive tasks called for same storage nodes again        caused the installation failure Fix: env.host_string is used to avoid recursive task call"