New csf v10.06

Changes:

• Added new entry in csf.pignore on cPanel servers for:
  exe:/usr/libexec/dovecot/indexer
  exe:/usr/libexec/dovecot/indexer-worker
• Croak if IPTABLES is not set, incorrect or not present in csf.conf
• Set SELinux context for /etc/logrotate.d/lfd on new generic installs