Release of BlueZ 5.18

This is mostly a bug fix release with issues fixed regarding LE single mode device detection and incorrect getpeername() calls which could have caused incorrect SDP records for profiles (mainly those using the Profile D-Bus interface with RFCOMM channel auto-allocation).

On the OBEX side we now have full OBEX authentication support, which is a fairly useless feature in practice but a mandatory one for qualification of some OBEX profiles. On the Android side the major feature addition this time is LE GATT client support.