Valgrind: Remove dialog asking for IP address.

When running the memcheck tool remotely, it sends its data via a TCP
socket to the development host, so it needs to know that machine's IP
address. The current code gathers all local network addresses and makes
the user choose one of them. However, we can get that information from
the SSH connection, so no user interaction is required.

Change-Id: Ia61decddd5fa1e285ca143605d944d6d9275b3e4
Reviewed-by: hjk <hjk121@nokiamail.com>
Nuke plugins PROVIDER settings

Place all plugins in lib/qtcreator/plugins

Change-Id: I66606910104b28d91038f5607850ce03bdd1b80f
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Centralize addition of plugin library paths

Change-Id: I9ddcc193b4d927c3d566eeb81c41f79a75920696
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>