Change time zone tests to respect Android changes.

There is a difference in how java.time on the OpenJDK treats time zone
names and how Android as a whole treats them, specifically when it comes
to the short names (abbreviations) of zones.

Android uses the CLDR data exclusively. CLDR only includes time zone
abbreviations in a given locale when that abbreviation is widely used in
that locale (for example: "CST" is "Central Standard Time" in en_US).
Other abbreviations that are arguably correct, but are not widely known
or used are not included in the data, such as "CST" for "Chinese
Standard Time". This means that there are rarely conflicts in the
abbreviations and no resolution mechanism is needed (and in fact ICU
doesn't provide one).

java.time in the OpenJDK (as well as other time zone name handling
methods) has abbreviations for almost every zone, even when the zones
are rarely used. This of course leads to many conflicts (such as CST for
Central Standard Time and Chinese Standard Time).

This port of java.time will stay consistent with how Android as a whole
handles time zone names and will use the ICU/CLDR data. This means that
many tests that expect specific results will fail.

Bug: 28832222
Test: compiles, fewer tests fail
Change-Id: Ic23c2795a440d61d97db8c4c44cfd35a053c0105