feat(rest): Fix response api for vendor

[tuannn2]

Issue:

• Currently, Response Vendor of Release, Component is array:

          "sw360:vendors": [
            {
                "url": "http://testvendor.com",
                "shortName": "TV",
                "fullName": "Vendor",
            }
        ]

Expected: Response Vendor of Release, Component is an Object:

        "sw360:vendor" : {
            "url" : "http://testvendor.com",
            "shortName" : "Vendor",
            "fullName" : "Test Vendor"
        }

How To Test?

Execute command call API:

$ curl 'https://sw360.org/api/releases/3765276512' -i -X GET \
    -H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJhdWQiOlsic3czNjAtUkVTVC1BUEkiXSwidXNlcl9uYW1lIjoiYWRtaW5Ac3czNjAub3JnIiwic2NvcGUiOlsiYWxsIl0sImV4cCI6MTY5NjQxMTUyMywiYXV0aG9yaXRpZXMiOlsiUkVBRCIsIldSSVRFIl0sImp0aSI6IjJUQ0dXMXdJNmNKb2xmNlR4d2lfTlEwR3NoWSIsImNsaWVudF9pZCI6InRydXN0ZWQtc3czNjAtY2xpZW50In0.LbrfvFrAGxpcmP7Mfrp1yfpwAoC9kl_VIn54plmP5Vvc80RR-d-l1ac8cAqvWtB3ku9SdSXz3FI5d0dCaJAsPBKQ5ahmPYeQIs7xoPs0_ZZQTeJSYWKvxRhn2zfpfP2onhcwmP4--UpjpKF1mtGGurL5sE2kq1W6EJxlHH4NSxn06L-iDBQJ5Z7m9DwoM0OoK3aORJ1S7VuwkQ0wKE28jACEqdmC0eA6oVjbue8sKdS-tIkxIkKxdkhlVJOuVRaDTcxH5Nr70Tw6y_MePHh8_QRZIVJgcYJ9dDi2yE5U1raLQSuRokbkX0QJonY2nSh_7Wdctb2o_JWSlLKNgrgazQ' \
    -H 'Accept: application/hal+json'

Checklist

Must:

• All related issues are referenced in commit messages and in PR

[ag4ums]

@tuannn2, is this change necessary? as this will break the existing rest client,

[tuannn2]

@tuannn2, is this change necessary? as this will break the existing rest client,

I just want to make sure the supplier's response represents the object as designed.
If there are rest client using it, there is no need to change it.

[ag4ums]

Closing this PR as it changes the endpoint output.. may be we have these correction in the next endpoint version (v2)