1142677: fix logrotate perm errors

/var/log/candlepin was owned tomcat.tomcat. logrotate
changes cause it to throw errors if the parent dir of
a logfile is group writeable and that group is not root.

Update spec file to create /var/log/candlepin with
owner tomcat, group root.
Merge pull request #734 from candlepin/alikins/1142677_logrotate_perms

1142677: fix logrotate perm errors