Fixed failing system tests in sam-cli

Fixed failing tests:
http://hudson.rhq.lab.eng.bos.redhat.com:8080/hudson/view/qe-headpin/job/official-sam-cli/58/ReportNG_Report/

TestClass : com.redhat.qe.katello.tests.cli.SystemTests
Test Methods : 
 test_system_customInfo_update 
 test_system_customInfo_remove 
 test_system_customInfo_addVariations 

Please, review it 
thanks