Add access modifier (`public`) to members and methods in `WP_Filesystem_SSH2`.

See #27881, #22234.

Built from https://develop.svn.wordpress.org/trunk@28491


git-svn-id: http://core.svn.wordpress.org/trunk@28317 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add access modifier (`public`) to methods in `WP_Importer`.

See #27881, #22234.

Built from https://develop.svn.wordpress.org/trunk@28492


git-svn-id: http://core.svn.wordpress.org/trunk@28318 1a063a9b-81f0-0310-95a4-ce76da25c4cd