Pluggable Auth: When setting new passwords for users trim any leading or trailing space to match what we do when we test passwords.

Fixes #23494


git-svn-id: http://core.svn.wordpress.org/trunk@23814 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-alpha-23815.

git-svn-id: http://core.svn.wordpress.org/trunk@23815 1a063a9b-81f0-0310-95a4-ce76da25c4cd