TemporaryBufferTest: Suppress "should be managed by try-with-resource"

TemporaryBufferTest: Suppress "should be managed by try-with-resource"

In most of the tests, the temporary buffer is explicitly destroyed in
a finally block after being closed. This is not possible if using the
try-with-resource construct, because the variable is not accessible in
the finally block scope.

Change-Id: I3bab30695ddd12e1a0ae107989638428fe3ef551
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>