Fix hardcoded log format

[sammcj]

Currently the log format in this module is hard-coded to timestamps as epoch rather than something readable (and easy to grep etc...).

https://github.com/thias/puppet-squid3/blob/master/manifests/params.pp#L53

The variable logformat can be used in squid.conf to set the log format as per https://github.com/thias/puppet-squid3/blob/master/templates/squid.conf.documented#L2258

Example:

logformat squid %tl.%03tu %6tr %>a %Ss/%03Hs %

access_log /var/log/squid/access.log squid

• Making Squid log timestamps human readable
• Squid Docs - logformat