Some cleanup/simplification:

1) Put knowledge of /tmp/fstab in munge_fstab rather
   than redirect input on calls. Check in munge_fstab
   whether /etc/fstab was successfully created, and exit
   install/upgrade with appropriate error if not. This
   error condition is therefore checked on install and upgrade.

2) Don't bother specifying value in exit statements - no one
   is checking whether it is 1, 2, or 0.

3) Put status messages inside check_fs rather than around
   invocation, and exit from check_fs if a fsck fails, rather
   than checking return value and exiting.

4) With above changes, simplify munge_fs/check_fs/mount_fs logic in
   upgrade.sh.

5) Various cosmetic cleanups.

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