Make all bluez calls asynchronous

Review Request #125785 - Created Oct. 25, 2015 and submitted - Latest diff uploaded

Jan Grulich
davidedmundson, lvsouza

This is a quick patch to address bug 354230. I don't know why this started happening on Kubuntu 15.10, I even tried to install it but couldn't reproduce. Anyway, this patch makes all bluez call asynchronous (at least I hope so). The only thing missing is that it now doesn't remember previous state of bluetooth adapter so if it's initially disabled and you turn on and then turn off the airplane mode, it will enable also all bluetooth adapters even when it shouldn't. Given that the bug is quite annoying and I don't want to spend sunday behind computer I would say that the new introduced issue is not that important and can be addressed later.