Defer the January 19, 2038 date limit in UFS1 filesystems to February 7, 2106
Standardize the definition of a UFS dinode.
Differential Revision: https://reviews.freebsd.org/D48472
(cherry picked from commit 1111a44301da39d7b7459c784230e1405e8980f8)
(cherry picked from commit aa90fbed151de512ab6e59f75df009533a15751f)
(cherry picked from commit 256389eaf158acaf67f0530764be8af68edee78c)
(cherry picked from commit 6cd973d903c8f214d84daf91eb75047631bf1618)
(cherry picked from commit e1ebda4458bbaf7d85fb803e20f3afc5441f24d9)