187-exact-test-counts-for-156

Exact test counts for 156

Spec 156's acceptance block carries four lines that accept `test result: ok. [1-9][0-9]* passed`, which pass while any one test in the target runs. This spec holds 156's block, carries it byte-identical, and replaces each loose line with spec 151's form: the tests the line ran, named with `--exact`, and `N passed; 0 failed`. One of spec 153's per-block tightening specs (153 D-5).