ceph-tests: Remove known-failure
ceph-tests: Remove known-failure

Apparently we fixed that recently without realizing it.

Change-Id: I2f623ffc1400f018c203e930a7b78dfdb9d6e61c
Related-Change: I8c98791a920eeedfc79e8a9d83e5032c07ae86d3

openstack/swift,tipabu/swift,tipabu/swift,tipabu/swift,openstack/swift,openstack/swift,openstack/swift,tipabu/swift