e2e: reformat error message with consistent formatting
e2e: reformat error message with consistent formatting

 To make the error return consistent across e2e tests we have decided
 to remove with error presence from the logs and this commit
 does that for e2e/ceph_user.go.

Signed-off-by: Humble Chirammal <dc8ba7e82a7df22725dedec9b10c7aaab9ec713f@redhat.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi