Format RAM/disk numbers properly, and comma separate IPs

- space-separating IP addresses makes this very hard to parse, because it means each row has variable size number of columns (servers with 2 IPs have one extra column).  With comma-separated IPs this is a no-brainer to parse in awk or cut.

- numbers such as RAM and disk should be always right aligned for readability, and should support non-integer values for RAM, since the smallest instances offered by Joyent can have < 1GB RAM size.