MB-8209: Need to process vbucket 0

if vbucket will fail for vbucket 0, but it is a valid case.

Change-Id: I73a7fa7c390be17a863bf5b11f660721df0c826e
MB-8205: Merge util_cli.py to couchbase_cli project

We have an older version of util_cli.py in couchbase-cli project.
Merge it and refer it from couchbase-cli to keep it consistent
across projects

Change-Id: I79d7cf189cb16d418b76b363540eec1a2315bbeb