Add support for validate-dcom
There will not be a specific page to support the validate-dcom command.
However, before create any DCOM node, this command will be called first, so that if there is error will report to the user before calling the create node.
If it is fine, DCOM node will be created.
GUI support will be in when backend deliver this.
When creating DCOM node, added the checkbox to allow user to run validate-dcom first before creating the node.
Also provide text box to specify the remotetestdir.
but there seems to be a bug in the backend regarding password, so as of now, this validate-dcom always failed.as