bigtable: temporarily disable replication test
bigtable: temporarily disable replication test

Change-Id: Idb0d51ae222bec599809a380b3745621cd55a8b7
Reviewed-on: https://code-review.googlesource.com/22170
Reviewed-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Gary Elliott <d49662846a332c09d32ce16a761e8169b9defdba@google.com>

googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go