added trailing slash to rsyslog::server's $server_dir default
added trailing slash to rsyslog::server's $server_dir default

When I applied `rsyslog::server`, with defaults, logs were ending up as `/srv/log<srcname>/file…` rather than `/srv/log/<srcname>/file…`.  I presume this is incorrect?

Ubuntu 12.04.2, rsyslog package 5.8.6-1ubuntu8.
fuel-infra/puppet-rsyslog,vmule/puppet-rsyslog,icann-dns/puppet-rsyslog,lclair/puppet-rsyslog,tbeitter/puppet-rsyslog,nickchappell/puppet-rsyslog,lclair/puppet-rsyslog,vmule/puppet-rsyslog,triforce/puppet-rsyslog,ekini/puppet-rsyslog,saz/puppet-rsyslog,plambert/puppet-rsyslog,TelekomCloud/puppet-rsyslog,tbeitter/puppet-rsyslog,icann-dns/puppet-rsyslog,alphagov/puppet-rsyslog,TelekomCloud/puppet-rsyslog,triforce/puppet-rsyslog,nesi/puppet-rsyslog,cybercom-finland/puppet-rsyslog,madkiss/puppet-rsyslog,sedan07/puppet-rsyslog,mrobbert/puppet-rsyslog,saz/puppet-rsyslog,raphink/puppet-rsyslog,plambert/puppet-rsyslog,ekini/puppet-rsyslog,coffeecoco/puppet-rsyslog,elmerfud/puppet-rsyslog_rs,cybercom-finland/puppet-rsyslog,sedan07/puppet-rsyslog,redhat-cip/puppet-rsyslog,elmerfud/puppet-rsyslog_rs,redhat-cip/puppet-rsyslog,nickchappell/puppet-rsyslog,mrobbert/puppet-rsyslog,madkiss/puppet-rsyslog,fuel-infra/puppet-rsyslog