SAP ConfigServlet OS Command Execution module

This module allows execution of operating system commands throug the
SAP ConfigServlet without any authentication.
remove Scanner mixin

remove Scanner mixin because this module is not a scanner modul
improve URI path and parameter handling

switch from PATH to TARGETURI datastore;
use normalize_uri to build uri;
use query in send_request_cgi to to prepare query string (instead of
vars_get that escapes the necessary semicolons)
remove unnecessary option declaration
remove unnecessary rank rating
make msftidy happy
remove aux module from master branch
sap_configservlet_exec_noauth auxiliary module

the final module was moved from my master branch to here because of the
pull request needs
add EDB ID to references
Land #1751, @andrewkabai's SAP Portal remote OS command exec
Do final cleanup for sap_configservlet_exec_noauth