unattended-upgrades: Remove useless comments
unattended-upgrades (<< 0.80~exp2) - i.e. wheezt - doesn't support  codename
Fix squeeze unattended-upgrades configuration

Squeeze is: release v=6.0.10,o=Debian,a=oldstable,n=squeeze,l=Debian,c=main
Squeeze-security is: release v=6.0,o=Debian,a=oldstable,n=squeeze,l=Debian-Security,c=main
Squeeze-updates is: release o=Debian,a=oldstable-updates,n=squeeze-updates,l=Debian,c=main
Squeeze-LTS is: release v=6.0-lts,o=Debian,a=squeeze-lts,n=squeeze-lts,l=Debian,c=main
Add LTS and -updates to squeeze unattended-upgrades configuration

Squeeze is: release v=6.0.10,o=Debian,a=oldstable,n=squeeze,l=Debian,c=main
Squeeze-security is: release v=6.0,o=Debian,a=oldstable,n=squeeze,l=Debian-Security,c=main
Squeeze-updates is: release o=Debian,a=oldstable-updates,n=squeeze-updates,l=Debian,c=main
Squeeze-LTS is: release v=6.0-lts,o=Debian,a=squeeze-lts,n=squeeze-lts,l=Debian,c=main
Merge pull request #43 from sathieu/for_upstream

Various unattended-upgrades fixes and enhancements