[server] removed iptables '-C' redirection since 2>&1 is always appended by other macros
[test suite] bug fix to ensure multiple SPA packets are sent for iptables duplicated rules tests
[server] iptables rule duplication bug fix to look for protocol name with -C support isn't available
[test suite] account for timestamp differences in iptables rule duplication tests
[server] restore backwards compatibility for Rijndael keys > 16 bytes in legacy mode by truncating (upgrading recommended of course)