test-client-custom-summary.c: Optimize test.

test-client-custom-summary.c: Optimize test.

Reuse the same two addressbooks for every test, so that only the
first 2 tests populate the addressbooks with contacts and the remaining
tests only create a client and execute a query.

Also add all test contacts with a single batch command and dont fetch
the test contacts, also removed the #if 0'd case which is the only
case which required the local contact copies.