Tapl: also logging contexts

Contexts were added for better diags when an assert happens, but they
are also useful for tracing the test execution.

Change-Id: I1512f3f7e02a373096bab4f0b390b1febfc96334
(cherry picked from commit 77ca70fea6caf94108ecaed593d71c9db5716cff)
1 file changed