Description of problem:
Have host without updates in cluster, run engine-host-update.py script. Host is put to maintenance and reinstalled. Should be rather checked if it has any update and if not left alone

Version-Release number of selected component (if applicable):
ovirt-engine-4.1.4.2-0.1.el7.noarch

How reproducible:
100%

Steps to Reproduce:
1. Have 1 host without any updates available
2. run `./engine-host-update.py --insecure --engine=localhost --username=admin@internal --password=mypass` --cluster=Default

Actual results:
Host is reinstalled

Expected results:
Host should be skipped