Temporaraly skip live read concern tests

mongod doesn't currently enable this functionality by default

Author: bjori

CONTRIBUTING.md

@@ -182,6 +182,16 @@ as environment variables:
 URI-escape the username, for example write "user@realm" as "user%40realm".
 The user must be authorized to query `test.collection`.
 
+MongoDB 3.2 adds support for readConcern, but does not enable support for
+read concern majority by default. mongod must be launched using
+`--enableMajorityReadConcern`.
+The test framework does not (and can't) automatically discover if this option was
+provided to MongoDB, so an additional variable must be set to enable these tests:
+
+* `MONGOC_ENABLE_MAJORITY_READ_CONCERN`
+
+Set this environment variable to `on` if MongoDB has enabled majority read concern.
+
 All tests should pass before submitting a patch.
 
 ## Configuring the test runner

tests/test-mongoc-collection.c

@@ -1428,8 +1428,14 @@ _test_count_read_concern_live (bool supports_read_concern)
    mongoc_client_destroy (client);
 }
 
+int
+mongod_supports_majority_read_concern (void)
+{
+   return test_framework_getenv_bool ("MONGOC_ENABLE_MAJORITY_READ_CONCERN");
+}
+
 static void
-test_count_read_concern_live (void)
+test_count_read_concern_live (void *context)
 {
    if (test_framework_max_wire_version_at_least (WIRE_VERSION_READ_CONCERN)) {
       _test_count_read_concern_live (true);
@@ -2890,7 +2896,7 @@ test_collection_install (TestSuite *suite)
    TestSuite_Add (suite, "/Collection/count", test_count);
    TestSuite_Add (suite, "/Collection/count_with_opts", test_count_with_opts);
    TestSuite_Add (suite, "/Collection/count/read_concern", test_count_read_concern);
-   TestSuite_Add (suite, "/Collection/count/read_concern_live", test_count_read_concern_live);
+   TestSuite_AddFull (suite, "/Collection/count/read_concern_live", test_count_read_concern_live, NULL, NULL, mongod_supports_majority_read_concern);
    TestSuite_Add (suite, "/Collection/drop", test_drop);
    TestSuite_Add (suite, "/Collection/aggregate", test_aggregate);
    TestSuite_Add (suite, "/Collection/aggregate/large", test_aggregate_large);