Skip test_container_synchronization

Skip test_container_synchronization

It's not supported by radosgw which is now used in Functest SUTs [1][2].
It's removed from CNTT which seems leveraging on ceph (at least RI) [3]

[1] https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/3.2/html/release_notes/bug-fixes
[2] http://artifacts.opnfv.org/functest/E46RCZLBRYCC/functest-opnfv-functest-smoke-hunter-tempest_slow-run-127/tempest_slow/tempest-report.html
[3] http://artifacts.opnfv.org/cntt/WKFRPQODPW34/cntt-opnfv-functest-smoke-latest-tempest_slow-run-37/tempest_slow/tempest-report.html

Change-Id: I8127df786c41af0d0285ef0e5cd1b28901685f65
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>