Disable buttons opening the modal forms on page unload

If button which opens a modal form is clicked after page started
reloading, form will disappear once reload is finished. To avoid this
glitch make user unable to press such buttons until reload finishes.

Change-Id: Id81a5e108644f99ee939296b54835f4f4ac2aaa7
Closes-Bug: #1357331
Fix for Data Processing Templates copy

The Cluster Template can now be copied even if it does not contain
the node_group_template_id field.

Utils refactored to use Sahara client correctly.

Change-Id: If876cb5692feb772e5c7ca8fb529033bed9cc5a3
Closes-Bug: #1349807
Merge "Fix for Data Processing Templates copy"
Merge "Disable buttons opening the modal forms on page unload"
Merge branch 'master' of https://github.com/openstack/horizon