Adding new params to mod_network_settings and mod_global_settings

Added these to mod_global_settings:
* ipmi_dcmi_over_lan_enabled
* remote_syslog_enable
* remote_syslog_port
* remote_syslog_server_address
* snmp_access_enabled
* snmp_port
* snmp_trap_port

Added these to mod_network_settings:
* dhcpv6_dns_server
* dhcpv6_rapid_commit
* dhcpv6_stateful_enable
* dhcpv6_stateless_enable
* dhcpv6_sntp_settings