Adapt web requests to new version of the API

[orviz]

The API spec for creating pipelines (POST /pipeline) has been slightly modified to cope with the requirement, triggered while implementing the QAA module, of having a different service per tool in the same criterion. The main change is that tools is no longer an array, but an object:

"sqa_criteria": {
  "criterion1": {
    "repos": [
      {
        "repo_url": "https://github.com/eosc-synergy/sqaaas-api-spec",
        "container": "testing",
        "commands": [],
        "tox": {},
        "tool": {
          "name": "string",
          "lang": "string",
          "jepl_support": true,
          "docs": "http://example.com",
          "docker": {},
          "executable": "string",
          "args": []
        }
      }
    ],
    "when": {}
  },
  "criterion2": {}
},

so that we ensure that:

• 1:1 relationship is created between a tool and a service (note that commands builder is an array, which still allows multiple commands when using the same criterion)
• 1:n relationship between criterion and tools, so multiple tools can be defined for the same repo by creating a new item in the repos array.