Tune nodepool

Increase defined max servers to 90 for hpcloud (actual max is 93;
leaving headroom for image creation and some leakage).

Set max limits for rax to more realistic levels.

Set min-ready to 10 across the board to double the number of ready
nodes as well as the rate at which nodes are replaced (60 total).

Change-Id: I71af098c2c49e62a557b3252f278a3dcb12b49a2
Set up new images on rackspace for check tests

Check tests queue is starved by the gate queue right now, so we want to
have a different pool of nodes for it. First of two patches, this one
sets up the images needed so that nodepool can get the image creation
done.

* modules/openstack_project/templates/nodepool/nodepool.yaml.erb:
Configure new devstack-precise-check image for use in check tests.

Change-Id: I8cff6f4f6cadcfa86d2488ae6768cefb1b2902a2