Red Hat Virtualization always puts the Manager's CA into the .vv file.
If a custom HTTPS certificate signed by a custom CA is used in Apache, then users won't be able to use the foreign menu of remote-viewer. Follow the instructions in https://bugzilla.redhat.com/show_bug.cgi?id=1336838 to make the Manager aware that a custom CA is used.
In this case the Manager will not place the CA into the .vv file and consequently the remote-viewer will trust the CAs trusted by the client system. If the client system trusts this particular CA, the foreign menu will work properly.