Extend API to support custom language pack creation

[Devdatta Kulkarni]

In Solum we want to support creation of custom language packs.
This bug is concerned with extending Solum's builder API for this purpose.

Idea is to start with something like:
POST /v1/solum/builder/lp-create with github repository URL containing the Dockerfile provided as an input

On the API/service side we will perform following steps:

- clone the git repo
- do 'docker build'
- do 'docker push' to Solum's docker registry to upload the LP

For details about custom language pack creation, refer to [1].

References:

[1] https://review.openstack.org/#/c/103689/9

[Angus Salkeld (asalkeld)]

how is this different to what this (below) does now?
https://github.com/stackforge/solum/blob/master/solum/builder/handlers/image_handler.py

[Adrian Otto (aotto)]

Angus, this is a way that the Dockerfile becomes the DSL for creation of new LP's.

[Devdatta Kulkarni (devdatta-kulkarni)]

The custom languagepack feature has been implemented.