Update apt-security-check

Added the --force-confdef (to make apt-get use the defailts) and --force-confold, to make apt-get use the conf file that we've changed when that's there.  You need to use both together.  See here - http://raphaelhertzog.com/2010/09/21/debian-conffile-configuration-file-managed-by-dpkg/
Merge pull request #16 from mattrm/master

Update apt-security-check
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
Update RT_SiteConfig.pm

Changed MaxInlineBody to 0 to allow larger emails to display.
Removed main mirrors and just left security ones