connman: allow user editable main.conf

In recent months I have seen a number of cases where users need to
change ‘prefer ethernet’ to ‘prefer wifi’ or where users are trying to
enable tethering for ethernet or are running other daemons that add
network interfaces that should not be auto-managed by comman. All of
these require user editing of main.conf so this change moves main.conf
to /storage where it can be tweaked under-the-hood if needed.
oe_setup_addon: create missing folder
Merge pull request #3358 from vpeter4/oe_setup_addon

oe_setup_addon: create missing folder
xbmc: oe_setup_addon: create missing folder (early)
systemd: drop double gcrypt depend
systemd: update to systemd-215
dbus-glib: update to dbus-glib-0.102

Signed-off-by: Stephan Raue <stephan@openelec.tv>
libffi: update to libffi-3.1

Signed-off-by: Stephan Raue <stephan@openelec.tv>
dbus: update to dbus-1.8.6

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xf86-video-nvidia: update to xf86-video-nvidia-331.89

Signed-off-by: Stephan Raue <stephan@openelec.tv>
bluez: update to bluez-5.21

Signed-off-by: Stephan Raue <stephan@openelec.tv>
tvheadend: update to tvheadend-3.9.1050
ffmpeg: change to official release

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc-master_ update to xbmc-master-14-687ac52, update FM patch, add patch to fix commit https://github.com/xbmc/xbmc/commit/6322457ea46e83491fa0675cb6ac9bf2e3578882

Signed-off-by: Stephan Raue <stephan@openelec.tv>
bcm2835-driver: update to bcm2835-driver-1e7d3d9

Signed-off-by: Stephan Raue <stephan@openelec.tv>
bcm2835-bootloader: update to bcm2835-bootloader-1e7d3d9

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/RPi/patches/xbmc-master: update RPi support patch

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: update to linux-3.15.4

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc-master: update to xbmc-master-14-dae6f76

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge pull request #3189 from chewitt/custom_connman

connman: allow user editable main.conf