libxt_time: deprecate --localtz option, document kernel TZ caveats

Comparing against the kernel time zone has significant caveats. This
patch adds documentation about the issue, and makes --utc the default
setting for libxt_time.

Furthremore, throw a warning on using the "--localtz" option, to avoid
confusion with one's shell TZ environment variable, and rename it to
"--kerneltz" to be explicit about whose timezone will be used.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

0 files changed, 0 insertions, 0 deletions