Define OneZone token prefix in the onezone configuration.

[bwilk]

OneZone token prefix should be configurable instead of hardcoded there:

slam/src/main/java/pl/cyfronet/indigo/repository/OneDataRepository.java

Line 91 in 2fb80ee

headers.add("X-Auth-Token", "indigo:" + oAuth2RestTemplate.getAccessToken().getValue());

It should be Implemented and documented.

[maricaantonacci]

In order to support multiple IdPs the token prefix should be dynamically computed, for example the information included in the user token might be used for this.