Fix typo: 'boostrap' -> 'bootstrap'

Change-Id: I50e515276e27eb0e4d376e8e29c719a185717175
Reviewed-on: http://review.couchbase.org/29019
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>