May want to bump this a bit more as the drain often completes amidst a
flurry of alloc updates.

Also delay "node complete" after the node has been marked complete to
capture a few more alloc events. There are other ways to implement this
that could trade off correctness for responsiveness as technically a
node is considered drained when all of its allocs have been marked to
stop and not when they've actually stopped (which may not happen for a
long time).

allow -detach like other commands

This PR allows marking a node as eligible for scheduling while toggling
drain. By default the `nomad node drain -disable` commmand will mark it
as eligible but the drainer will maintain in-eligibility.

This PR moves creating the API client into the returned predict
function. The creation of the client causes a lookup of all the system
certificates and doing that for each command on mac was extremely slow.

@chelseakomlo heads up on this change

* Require at least two characters for identifier
* Automatically strip off the last character in case of uneven length

* Fix tests
* Update documentation

* Refactor other cli commands to new design
* Add PrefixList method to api package
* Add more tests

* Reverted changes to get methods
* Added prefix query parameter
* Updated node status to use prefix based searching
* Fixed tests
* Removed truncation logic