Remove MiqSshUtilV1 as Net::SSH V2.x is used by CFME 5.2+.
Use Tempfile in MiqSshUtil#temp_cmd_file

to create a temporary file.
Add spec lib/spec/util/miq_ssh_util_v2_spec.rb.
Merge pull request #336 from lfu/ssh_temp_file_1107533

Use Tempfile in MiqSshUtil#temp_cmd_file.