Fix - Do not insert values on initial changeset creation for read-only fields

forgeupgrade: remove previoulsy wrongly inserted values in changesets

Change-Id: I430338b6af38112c542a3fe73a3559fdc74aead5
Merge commit 'refs/changes/29/1529/2' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix - Do not insert values on initial changeset creation for read-only fields

Change-Id: Ie8e51e61b4a82ceb5a759472e0e014c0f0eeced8
This is Tuleap 6.7.99.24

Change-Id: Ied9bebeeef7f35ea96c68faf9b52aad4f545adc1