NXP-7667 add eTag info to nxbigfile request
NXP-7667 protect SQLBlob cast
NXP-7667: Add DownloadServlet ETag Test
Merge branch 'FEATURE-5.6.0-NXP-7667-Add-ETag-on-nxbigfile-servlet' of github.com:toweins/nuxeo-services into toweins-FEATURE-NXP-7667-Add-DownloadServlet-ETag-Test
NXP-7667 refactor test
NXP-7667 update test