kvm: Check the return value of the cloudstack-setup-agent command

Bug-Url: https://issues.apache.org/jira/browse/CLOUDSTACK-8016
Signed-off-by: Laszlo Hornyak <laszlo.hornyak@gmail.com>
Signed-off-by: Rajani Karuturi <rajanikaruturi@gmail.com>

This closes #93

Author: K0zka

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

@@ -205,7 +205,12 @@ public boolean processTimeout(long agentId, long seq) {
             parameters += " --guestNic=" + kvmGuestNic;
             parameters += " --hypervisor=" + cluster.getHypervisorType().toString().toLowerCase();
 
-            SSHCmdHelper.sshExecuteCmd(sshConnection, "cloudstack-setup-agent " + parameters, 3);
+            if (!SSHCmdHelper.sshExecuteCmd(sshConnection,
+                    "cloudstack-setup-agent " + parameters, 3)) {
+                s_logger.info("cloudstack agent setup command failed: "
+                        + "cloudstack-setup-agent " + parameters);
+                return null;
+            }
 
             KvmDummyResourceBase kvmResource = new KvmDummyResourceBase();
             Map<String, Object> params = new HashMap<String, Object>();