Replace usage of *.{Id,UUID}.parse() method in test

The main use case of that method is to parse the {Id, UUID} received
from the http request. The method requires an encoder to be configured
using KeyUtil.setEncoderImpl.

In the test, create Account.Id, Change.Id and AccountGroup.UUID using
constructor instead of parse method. This simplifies the code and allows
to remove the encoder setup in IndexEventHandlerTest because it no
longer depends on parse method.

Change-Id: Ifdf4eb94edc909990faad3647898973bed0cff2f
5 files changed