droid-config-fp2-siphon-bluez4 is for the Fairphone2, it would be droid-config-hammerhead-bluez4 for the N5.

And as i said, i never got it working like the HADK says, maybe you need some of the commits regarding bluetooth from RealJohnGalts repo.

EDIT: Yep it is a kernel issue, check these commits:

https://github.com/RealJohnGalt/andr...90b79cb1ffb236
https://github.com/RealJohnGalt/andr...7de2fbffadc5d5
https://github.com/RealJohnGalt/andr...d3582370496904
https://github.com/RealJohnGalt/andr...a3fbf44be74284
https://github.com/RealJohnGalt/andr...7c89d694d9257f
https://github.com/RealJohnGalt/andr...23206340ef8120
https://github.com/RealJohnGalt/andr...b16fd9567bb5b8
https://github.com/RealJohnGalt/andr...0ce135204ea099
https://github.com/RealJohnGalt/andr...1c3db1934a4a35
https://github.com/RealJohnGalt/andr...6c40ede400d9e2
https://github.com/RealJohnGalt/andr...564fc68ec84be0

Compiled my custom kernel, which has these commits and bluetooth is working.

EDIT2: CONFIG_BT_MSM_SLEEP should be y.

EDIT3: When you SSH into your device do you get the nemo@sailfish bash prompt?