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.
Return VixDiskLib Load Error to DRB Client

When VixDiskLibServer fails to successfully load any
version of the VixDiskLib, cache the failure reason.
Interrogate for the error once the DRB service is started
so that the failure reason can be passed back to the client
for presentation in the UI. Then shut down the DRB service.