INDY-1087: add improvements for setup_iptables script. (#533)
INDY-1087: add improvements for setup_iptables script. (#533)

The following features were added:
 - logging of rejected connections;
 - checking for rule existance before appending.

Signed-off-by: Sergey Shilov <064bbdfaeb89a0bebebfe7b388747a73c8941704@dsr-company.com>
spivachuk/sovrin-node,spivachuk/sovrin-node,spivachuk/sovrin-node,spivachuk/sovrin-node