CppEditor: more autotests for follow under cursor

Add autotests for follow under cursor for constructors and
destructors.

Task-number: QTCREATORBUG-7485
Change-Id: I43cc12f54b93a582203cd52c1fd61fedf9198e74
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Debugger/RemoteLinux: Make gdbserver location configurable

This helps in situation where the location of the gdbserver
installation is not under the control of the user and he
also can't tweak path settings on the device.

Change-Id: Iab5bbfef765879bf59930cc416385c692056da93
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>