cbcollect_info couchbase.log leaks CB_REST_USERNAME CB_REST_PASSWORD

The couchbase CLI and cbbackup/transfer/restore can use ENV Variables for username and password (added with MB-10268)

Unfortunately these are also picked up and recorded in plain text with cb_collect in the couchbase.log

...
Processes' environment
(pgrep beam.smp; pgrep memcached) | xargs -n1 – sh -c 'echo $1; ( cat /proc/$1/environ | tr
0
n ); echo' –

....

SHELL=/bin/bash
CB_REST_USERNAME=root
CB_REST_PASSWORD=password