Reduce memory requirement to 2gb for fedora ci jobs

.redhat-ci.inventory

@@ -9,6 +9,7 @@ ansible_python_interpreter=/usr/bin/python3
 deployment_type=origin
 openshift_image_tag="{{ lookup('env', 'OPENSHIFT_IMAGE_TAG') }}"
 openshift_master_default_subdomain="{{ lookup('env', 'RHCI_ocp_node1_IP') }}.xip.io"
+openshift_check_min_host_memory_gb=1.9
 
 [masters]
 ocp-master