e2fsck: Fix and enhance superblock dates in future problem reports

e2fsck: Fix and enhance superblock dates in future problem reports

Fixed a bug where e2fsck would report that last mount time was in the
future when it was really the last write time that was in the future.

Also, since people can't seem to believe that (a) their distribution
has buggy init scripts, or (b) their CMOS/RTC clock or backup battery
is dead, print the incorrect time and the current system time.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>