Create angular prompt service

Registered by Shaoquan Chen

Summary
=======
An angular-based prompt UI as a service is needed in some places. The UX and API of invoke the service is to simulate window.prompt() method: showing prompt modal dialog and excuse callback with user's input.

Motivation
========
Providing a common UX as an angular service to simplify developer's work with a consistent UI/UX.

Description
=========
simulate window.prompt() method.

UX
===

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Shaoquan Chen
Direction:
Needs approval
Assignee:
Shaoquan Chen
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
David Lyle

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/angular-prompt-service,n,z

Addressed by: https://review.openstack.org/241399
    Adding angular prompt service - WIP

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