Implement an exact match on the unit test suite

[donporter]

Currently, the unit test tool for splinterdb implements a prefix match. The comments indicate it should be an exact match. For instance, if one wishes to run the btree suite in isolation, it also runs btree_stress.

From current main:

Running 2 CTests, suite name 'btree', test case 'all'.
TEST 1/7 btree:test_leaf_hdr_search [OK]
TEST 2/7 btree:test_index_hdr [OK]
TEST 3/7 btree:test_index_hdr_search [OK]
TEST 4/7 btree:test_leaf_split [OK]
TEST 5/7 btree:test_leaf_hdr [OK]
TEST 6/7 btree_stress:test_random_inserts_concurrent

With this change:

Running 1 CTests, suite name 'btree', test case 'all'.
TEST 1/5 btree:test_leaf_hdr_search [OK]
TEST 2/5 btree:test_index_hdr [OK]
TEST 3/5 btree:test_index_hdr_search [OK]
TEST 4/5 btree:test_leaf_split [OK]
TEST 5/5 btree:test_leaf_hdr [OK]
RESULTS: 5 tests (5 ok, 0 failed, 0 skipped) ran in 2 ms

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[rtjohnso]

I tweaked your code and pushed it as a new PR #643 , which is now merged. So, closing this PR.