ETP client fails when delegation is enabled

With delegation='' or delegation='${ENTITLEMENTS_URL}' option, it is not working as expected (even when preship user was added in the correct groups) (See comment in MR for more details on logs) If delegation it is removed, the open-etp-server it is working fine (issue with delegation and authentication issue on c++ code), this is likely to be a related issue: #21 However, there is a different issue in master about connection reset (Not sure if we need to introduce delays in each test to fix it log output from pipeline)

Open-etp-client it is dependent on this delegation auth method, therefore, if delegation it is enabled, open-etp-client will fail, therefore auth delegation must be fixed first in open-etp-server.