Revert "Revert "Do not restart when upgrading (ev3dev/ev3dev/#183)""

This reverts commit 9eb9257a5b83d57dfdf837eb82e9e3aad40d86e1.
Fix preferred blutooth role matching
Fix crash when connecting to Windows 7 PANU

Issue ev3dev/ev3dev#195
Update changelog for 1.26-0ev3dev6