Description of problem:

Failed to uninstall eventrouter with logging. The messages are in the below:

fatal: [$master]: FAILED! => {
    "assertion": "_current_logging_namespace.split(\" \") | count <= 1", 
    "changed": false, 
    "evaluated_to": false, 
    "failed": true, 
    "msg": "Configuring aggregated logging in multiple namespaces is not supported:   current namespace(s): default openshift-logging   specified namespace: default openshift-logging"
}


Version-Release number of selected component (if applicable):
# oc version
oc v3.10.0-0.30.0
kubernetes v1.10.0+b81c8f8
features: Basic-Auth GSSAPI Kerberos SPNEGO

openshift v3.10.0-0.31.0
kubernetes v1.10.0+b81c8f8

# rpm -qa | grep openshift-ansible
openshift-ansible-3.10.0-0.31.0.git.0.9f771c7.el7.noarch
openshift-ansible-roles-3.10.0-0.31.0.git.0.9f771c7.el7.noarch
openshift-ansible-docs-3.10.0-0.31.0.git.0.9f771c7.el7.noarch
openshift-ansible-playbooks-3.10.0-0.31.0.git.0.9f771c7.el7.noarch

# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 7.5 (Maipo)
# uname -a
Linux host-$master-ip 3.10.0-862.el7.x86_64 #1 SMP Wed Mar 21 18:14:51 EDT 2018 x86_64 x86_64 x86_64 GNU/Linux


How reproducible:
Always

Steps to Reproduce:
1. Deploy eventrouter by setting the following value in inventory file and run ansible-playbooks:
openshift_logging_install_logging=true
openshift_logging_install_eventrouter=true

2. Wait until all pods are running, then set "openshift_logging_install_logging=false
openshift_logging_install_eventrouter=false" in inventory and rerun ansible-playbooks

Actual results:
Failed to uninstall eventrouter

Expected results:
Eventrouter can be uninstalled successfully.

Additional info:
image version
logging-curator/images/v3.10.0-0.31.0.0
logging-fluentd/images/v3.10.0-0.31.0.0
logging-eventrouter/images/v3.10.0-0.31.0.0