Add ability to filter by version for listHosts and listMgmtServers APIs (apache#12472)

* Add ability to filter by version for listHosts and listMgmtServers APIs

* Address review comment

* Fix listMgmtServers API

Author: nvazquez

api/src/main/java/org/apache/cloudstack/api/command/admin/management/ListMgmtsCmd.java

@@ -45,6 +45,10 @@ public class ListMgmtsCmd extends BaseListCmd {
             since = "4.20.1.0")
     private Boolean peers;
 
+    @Parameter(name = ApiConstants.VERSION, type = CommandType.STRING,
+            description = "the version of the management server", since = "4.20.3")
+    private String version;
+
     /////////////////////////////////////////////////////
     /////////////////// Accessors ///////////////////////
     /////////////////////////////////////////////////////
@@ -61,6 +65,10 @@ public Boolean getPeers() {
         return BooleanUtils.toBooleanDefaultIfNull(peers, false);
     }
 
+    public String getVersion() {
+        return version;
+    }
+
     /////////////////////////////////////////////////////
     /////////////// API Implementation///////////////////
     /////////////////////////////////////////////////////