LibvirtServerDiscoverer should only process added KVM hosts (#7979)

Don't use LibvirtServerDiscoverer's processHostAdded() in CustomServerDiscoverer

Signed-off-by: Marcus Sorensen <mls@apple.com>
Co-authored-by: Marcus Sorensen <mls@apple.com>

Author: Marcus Sorensen

server/src/main/java/com/cloud/hypervisor/discoverer/CustomServerDiscoverer.java

@@ -29,4 +29,9 @@ public Hypervisor.HypervisorType getHypervisorType() {
     protected String getPatchPath() {
         return "scripts/vm/hypervisor/kvm/";
     }
+
+    @Override
+    public void processHostAdded(long hostId) {
+        // Not using super class implementation here.
+    }
 }

server/src/main/java/com/cloud/hypervisor/kvm/discoverer/LibvirtServerDiscoverer.java

@@ -110,7 +110,7 @@ public AgentControlAnswer processControlCommand(long agentId, AgentControlComman
     @Override
     public void processHostAdded(long hostId) {
         HostVO host = hostDao.findById(hostId);
-        if (host != null) {
+        if (host != null && getHypervisorType().equals(host.getHypervisorType())) {
             directDownloadManager.syncCertificatesToHost(hostId, host.getDataCenterId());
         }
     }