Clean up cat headers

[drewr]

Remove duplicate cache columns, add aliases, normalize header names across actions.

For example:

==== nodes ====
id                       | id,nodeId                 | unique node id
pid                      | p                         | process id
host                     | h                         | host name
ip                       | i                         | ip address
port                     | po                        | bound transport port
version                  | v                         | es version
build                    | b                         | es build hash
jdk                      | j                         | jdk version
disk.avail               | d,disk,diskAvail          | available disk space
heap.percent             | hp,heapPercent            | used heap ratio
heap.max                 | hm,heapMax                | max configured heap
ram.percent              | rp,ramPercent             | used machine memory ratio
ram.max                  | rm,ramMax                 | total machine memory
load                     | l                         | most recent load avg
uptime                   | u                         | node uptime
node.type                | type,dc,nodeType          | d:data node, c:client node
master                   | m                         | m:master-eligible, *:current master
name                     | n                         | node name
completion.size          | cs,completionSize         | size of completion
fielddata.memory_size    | fm,fielddataMemory        | used fielddata cache
fielddata.evictions      | fe,fielddataEvictions     | fielddata evictions
filter_cache.memory_size | fcm,filterCacheMemory     | used filter cache

Closes #4852

[drewr]

Merged 90b4434