Fix /run/keys permissions

(cherry picked from commit 57ed344917d909ca6ef76f24b3bb78f75b7ec407)
Remove illegal meta.src attributes

(cherry picked from commit 1da6a7d4a915e48934fbaa27fe01db1211d00df7)
Make pseudo-filesystems show up as "tmpfs" etc. rather than "none" in df

(cherry picked from commit 4269582078265c87b146012e83bdf5bba466d997)