compute_graph (text/javascript) and the machine type, disk bus, video
model and domain capability views (text/html) return JSON; send it as
application/json. create_instance_w1.html builds the chipset <option>
elements with .val().text() instead of string concatenation.
* Add rest framework for API: First Commit
* modify some shell scripts to make variable references safer; modify some python scripts to reduce the code complexity and cyclomatic complexity of functions.
* Add REST API for some webvirtcloud functions. Instance list/delete/create, compute list/delete/create, storages-network list/retrieve. Add swagger and redoc for API interface
* update requirements
Co-authored-by: herengui <herengui@uniontech.com>
