kvm: truncate vnc password to 8 chars (apache#6244)

This PR truncates the vnc password of kvm vms to 8 chars to support latest versions of libvirt.

(cherry picked from commit aa0197c)
Signed-off-by: Rohit Yadav <[email protected]>

Author: weizhouapache

plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtVMDef.java

@@ -1764,7 +1764,7 @@ public String toString() {
                 graphicBuilder.append(" listen=''");
             }
             if (_passwd != null) {
-                graphicBuilder.append(" passwd='" + _passwd + "'");
+                graphicBuilder.append(" passwd='" + StringUtils.truncate(_passwd, 8) + "'");
             } else if (_keyMap != null) {
                 graphicBuilder.append(" _keymap='" + _keyMap + "'");
             }

plugins/hypervisors/kvm/src/test/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResourceTest.java

@@ -60,6 +60,7 @@
 import org.apache.cloudstack.utils.linux.MemStat;
 import org.apache.cloudstack.utils.qemu.QemuImg.PhysicalDiskFormat;
 import org.apache.commons.lang.SystemUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.joda.time.Duration;
 import org.junit.Assert;
 import org.junit.Before;
@@ -773,7 +774,7 @@ private void verifyGraphicsDevices(VirtualMachineTO to, Document domainDoc, Stri
         assertXpath(domainDoc, prefix + "/graphics/@type", "vnc");
         assertXpath(domainDoc, prefix + "/graphics/@listen", to.getVncAddr());
         assertXpath(domainDoc, prefix + "/graphics/@autoport", "yes");
-        assertXpath(domainDoc, prefix + "/graphics/@passwd", to.getVncPassword());
+        assertXpath(domainDoc, prefix + "/graphics/@passwd", StringUtils.truncate(to.getVncPassword(), 8));
     }
 
     private void verifySerialDevices(Document domainDoc, String prefix) {