reopen the fvt case of guest_inspect_xxx with userid list
reopen the fvt case of guest_inspect_xxx with userid list

userid should be specified in string with "userid1, userid2"
userid as "" would trigger validation error 400.

Change-Id: I85ba71f6e3d61e0472d96ab8f3acc0edb4e4476f

mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk