Part of gathering errata's info we search for /katello/api/v2 path which does not exist when engine is integrated as external provider with foreman installation. this raises exception each call to GetErrataForSystemQuery which should not be called if katello is not installed 

2015-09-16 18:45:25,796 ERROR [org.ovirt.engine.core.bll.host.provider.foreman.ForemanHostProviderProxy] (default task-43) [] Exception is https://satellite.testenv:8888/katello/api/v2/systems?search=facts.network.hostname:bronhaim.usersys.redhat.com&format=json 
2015-09-16 18:45:25,797 ERROR [org.ovirt.engine.core.bll.GetErrataForSystemQuery] (default task-43) [] Query 'GetErrataForSystemQuery' failed: EngineException: https://satellite.testenv:8888/katello/api/v2/systems?search=facts.network.hostname:bronhaim.usersys.redhat.com&format=json (Failed with error PROVIDER_FAILURE and code 5050)
2015-09-16 18:45:25,797 ERROR [org.ovirt.engine.core.bll.GetErrataForSystemQuery] (default task-43) [] Exception: org.ovirt.engine.core.common.errors.EngineException: EngineException: https://satellite.testenv:8888/katello/api/v2/systems?search=facts.network.hostname:bronhaim.usersys.redhat.com&format=json (Failed with error PROVIDER_FAILURE and code 5050)
	at org.ovirt.engine.core.bll.provider.BaseProviderProxy.getResponse(BaseProviderProxy.java:139) [bll.jar:]
	at org.ovirt.engine.core.bll.provider.BaseProviderProxy.runHttpMethod(BaseProviderProxy.java:185) [bll.jar:]
	at org.ovirt.engine.core.bll.provider.BaseProviderProxy.runHttpMethod(BaseProviderProxy.java:163) [bll.jar:]
	at org.ovirt.engine.core.bll.host.provider.foreman.ForemanHostProviderProxy.runHttpGetMethod(ForemanHostProviderProxy.java:65) [bll.jar:]




Steps to Reproduce:
1. we should not call GetErrataForSystemQuery when foreman is the provider