Fix#6445
Problem:
When an HttpServer instance is trying to register a resource that
is already taken, it causes all HttpServers to terminate, which
is not a desired behavior.
Root Cause:
It appears the Msf::Exploit::Remote::TcpServer#stop_service method
is causing the problem. When the service is being detected as an
HttpServer, the #stop method used actually causes all servers to
stop, not just for a specific one. This stopping route was
introduced in 04772c8946, when Juan
noticed that the java_rmi_server exploit could not be run again
after the first time.
Solution:
Special case the stopping routine on the module's level, and not
universal.
wchen-r7