Fix ZoneInfo.useDaylightTime()

Currently implemented is "are there any offset transitions
in the future?".
This is wrong: Transitions may occur in the future because
of DST, but can also occur for other reasons (e.g. if the
raw offset for a zone changes).

We should be implementing: Is the currently active transition,
or any transition in the future, one that has
isDst == true.

This was causing a test failure in
libcore.java.util.TimeZoneTest#testDisplayNames
for Asia/Novokuznetsk and Europe/Simferopol for
tzdata2014g. This is because they have a transition entry
for October 26, 2014 (i.e. in the future).

For each, the existance of the transition entry is not
due to an offset change at all:
For Asia/Novokuznetsk it is because the abbreviation
for the zone changes on that date (information we don't
curently use).
For Europe/Simferopol it is because the offset from
UTC changes on that date (but there is no actual DST
transtion).

Bug: 17377276

(cherry-picked from commit d42af6ed)

Change-Id: I148503280b8dee653bac32eec3aa58d232102628