Fixed the host-collection update failing in jenkins

Please review it : 

For Hostcollection update : test_positive_update_1
the test is failing in nightly  
https://gist.github.com/tkolhar/2d49dcca34a20c5588c6
so fixed that issue 

Also, files a BZ for below jenkins failures : BZ id : 1171669
tests.foreman.cli.test_host_collection.TestHostCollection.test_positive_update_2_1___description___u_832850887842610__ (from nosetests) 

tests.foreman.cli.test_host_collection.TestHostCollection.test_positive_update_3_1_3 (from nosetests) 

http://satellite-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/satellite6-automation/

please, review it
thanks