support jinja 2.7; several bug fixes

Make rsylog-gnutls package not required - only if using input or output
that requires gnutls

Fixing bugs in permitted_servers and permitted_clients parameter in relp.

Issue: cert and key files should be deployed in the /etc/pki/tls folder

README - Removing a duplicated "port" in the relp output parameter.

use FROMHOST instead of HOSTNAME for remote files log file name

Bug fix in relp_output - there was inconsistencies in the parameters.

Bug fix in relp_input - an unwanted loop index was added as suffix

support jinja 2.7