Fix pep8 complaints

Signed-off-by: Louis Bouchard <louis.bouchard@canonical.com>
Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>
Add collection for squid-deb-proxy if present

Signed-off-by: Louis Bouchard <louis.bouchard@canonical.com>
Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>
Add squid3 log collection

Signed-off-by: Louis Bouchard <louis.bouchard@canonical.com>
Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>