When trying offline resize2fs, it require running fsck first, which
takes time, especially on large volumes. And in most cases, resize2fs
will notice that no action is needed - after wasting some time on fsck.
To remedy this, use resize2fs in online mode (on mounted filesystem).
And drop fsck call if it fails (filesystem is already mounted
read-write, running fsck isn't good idea).
But do not remove fsck call completely - still call it, but without '-f'
flag, so it run actual check only when really needed (unclean shutdown,
last check far in the past etc).
FixesQubesOS/qubes-issues#979FixesQubesOS/qubes-issues#2583
