Fix kvm session and add event bus

Bug description:
    Before this commit KVM window wasn't being closed
    after logging out

Test: Step1. Launch webui on browser and see KVM page on /#/operations/kvm.
    Step2. Open additional window using 'Open in new tab'.
    Step3. Navigate to another page. For example, /#/operations/key-clear.
    Step4. Logout. Window is still open.

Change-Id: Ife79ebca41eb4d588c0b8f4fae06135420eda155
Signed-off-by: Konstantin Maskov <sulwirld@gmail.com>
diff --git a/src/eventBus.js b/src/eventBus.js
new file mode 100644
index 0000000..c31c98a
--- /dev/null
+++ b/src/eventBus.js
@@ -0,0 +1,5 @@
+import Vue from 'vue';
+
+const eventBus = new Vue();
+
+export default eventBus;