Description of problem:
When installing a second server in an HA configuration, if the server name provided during installation is the same as an existing server, the affect is that the existing server no longer exists and its configuration is simply replaced by the new server.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install a JON server
2. Install a second JON server in HA configuration using the 'New server' option and the exact same "Server Name" as the first
From Administration -> High Availability -> Servers only the second server is shown
The installer should fail to proceed indicating that a server already exists with the specified name and either the Replace option should be used or a unique name should be given.