rpcfg.py cannot config the webserver successfully.

[zhiming99]

The steps to reproduce this issue:

1. in a bash shell, run /usr/local/bin/rpcf/rpcfg.py
2. switch to the security tab
3. press the config webserver button.
4. start a testcase, and the client is rejected immediately.

[zhiming99]

The issue is because the rpcfg.py did not call the right function in the button handler for config webserver. A workaround is to check the checkbox WS Installer right below the button, and then push the config webserver button.
A fix has been submitted in commit a63cd29 on the development branch.