Previously, normalize_timestamp was widely used in tests to generate a
string representation of a Timestamp. However, tests should often be
using the internal format of a Timestamp. This patch retires the use
of normalize_timestamp in tests.
The preferred mechansim for generating sample timestamps in unit tests
is to use the timestamp iterator helper available via
BaseUnitTestCase.ts_iter and BaseUnitTestCase.ts(). This patch adopts
this pattern, but there is still further work required to make all
tests use the pattern consistently.
Change-Id: I2b6cee7e7a189294d4e28b7cb2aadadd10a11c2d
Signed-off-by: Alistair Coles <alistairncoles@gmail.com>
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