Speed up slow tell-based Distributed*IntegrationTest cases

Some test cases for tell-based take up to 2 minutes due to the default
2 minute request timeout and 30 sec backend aliveness timer. Speed up
the tests by setting much lower values.

Change-Id: If8dba80d625ded8753178e937f14b435675ef0e4
Signed-off-by: Tom Pantelis <tompantelis@gmail.com>