CS-14952: Nexus vSwitch: vCenter IP Address and DataCenter information is not present in the "virtual_supervisor_module" table. VSwitch Crendentials are not encrypted.

Description:

	Qualifying the VSM password stored in virtual_supervisor_module
	as encryptable. The encryption/decryption is transparently done
	by the cloudstack DAO layer.

server/src/com/cloud/network/CiscoNexusVSMDeviceVO.java

@@ -58,7 +58,7 @@ public class CiscoNexusVSMDeviceVO implements CiscoNexusVSMDevice, Identity{
     @Column(name = "username")
     private String vsmUserName;
     
-    @Column(name = "password")
+    @Column(name = "password", encryptable=true)
     private String vsmPassword;
 
     @Column(name = "ipaddr")