Merge pull request #16 from mattrm/master

Update apt-security-check
Moved unattended upgrades file into unattended upgrades roll
Added main.yml with basic code for unattended upgrades.  Still bit more to do.
Added 10confdefandold to files and finished main.yml
Changed 50-unattended so that backports and updates are used as well as stopping updates on kernel stuff
Adds Adam McGreggor as a user
Merge pull request #18 from adamamyl/feature/adds-adam-keys

Adds Adam McGreggor as a user
Give labs folk sudo on labs server
Give Pierre temp sudo access to sparql servers
Remove unused host vars
Rename files to end with yml
Give labs folk sudo on labs server
Give Pierre temp sudo access to sparql servers
Added a task to copy the cronjob files over so that rsnapshot will start
Merge pull request #19 from nigelbabu/host-vars-cleanup

Host vars cleanup
Added task and template file to add main ubuntu mirrors to ubuntu servers
Added when statement to the file
Added .j2 to the main.yml
Added Nigel's repo suggestions
Change group from sparql_dev to labs_dev

Correcting my mistake in copy & paste from last time