So far, if some component mounts a DDI in some local mount namespace we created a temporary mountpoint in /tmp/ for that. Let's instead use the same directory inode in /run/ instead. This is safe, since if everything runs in a local mount namespace (with propagation on /run/ off) then they shouldn't fight for the inode. And it relieves us from having to clean up the directory after use. Morever, it allows us to run without /tmp/ mounted. This only moves dissect-image.c and the dissec tool over. More stuff is moved over later.
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