Added oscurl command.

Usage: oscurl [options]

Options:
  -h, --help            show this help message and exit
  -s SERVICE, --service=SERVICE
                        service name or type, default=compute
  -m METHOD, --method=METHOD
                        request method (POST/GET/DELETE/...), default=GET
  -p PATH, --path=PATH  differential path of URL
  -P FULLPATH, --full-path=FULLPATH
                        full path of URL
  -f FORMAT, --format=FORMAT
                        type of response
                        output(RAW|HEADER|BODY|YAML|JSON|NONE), default=RAW
  -d, --debug           debug mode
  -r, --dump-request    dump HTTP request