Fix local variable name.
Fix local variable name.

Fix bug found after merge of PR:
https://github.com/ManageIQ/manageiq/pull/5504/files.
ems_host -> ems

https://bugzilla.redhat.com/show_bug.cgi?id=1283369

rsevilla87/manageiq-gems-pending,rsevilla87/manageiq-gems-pending,aljesusg/manageiq-gems-pending,aljesusg/manageiq-gems-pending