Potential Bug to parse kudu client endpoint

[jdneo]

The code here is to build the web app's default host URL to kudu's endpoint. (Add .scm).

But it has potential bugs here. Please note that the host URL will be all lowercase, while the webAppBase.name() is case sensitive and may have upper cases. So the .replace() method might not work here.

At least we need to change it to lower case before calling the .replace() method.