update the iso to v1.2.0 for various fixes

@SvenDowideit released this 12 hours ago

Docker v1.2.0
Linux Kernel 3.16.1
Add /etc/os-release file version and distro info.
Attempt to sync the clock better
Add /var/lib/boot2docker/profile for customising Docker daemon settings
Speed up SSH by turning off DNS check
Log boot output to /var/log/boot2docker.log
Add infrastructure to allow Docker TLS Socket
Fix devmapper Docker test
Fix fix 'sudo -i and sudo su -'