Implement some missing xCAT functionality

[Obihoernchen]

• makedns like command for dnsmasq --> use confluent2hosts + dnsmasq
• makedhcp like command for dnsmasq for non PXE boot DHCP requests --> Implement confluent2dnsmasq #216
• makentp like command for chronyd --> configure manually on confluent host, ntp.servers can be used on deployed nodes already
• net.extraparams --> Add net.extra_settings for passthrough network settings #234
• rsyslog configuration --> Add remote syslog forwarding for deployed nodes #236

[jjohnson42]

For makedns for dnsmasq, that would pretty much be confluent2hosts. However I'd suggest that other DNS solutions are desired, if for no other reason than some people having a 'home router' perception of dnsmasq, even if it is technically capable of the load. Beyond that there are some record types that may call for a full DNS server, even though confluent doesn't matter.