Fix isasladm CLI prompt

Change-Id: I097748f2114e19388128c5355dd13ed239447231
Reviewed-on: http://review.couchbase.org/25465
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>