Migrate alternator tests to PythonTestSuite

As part of the unification process, alternator tests are migrated to the PythonTestSuite instead of using the RunTestSuite. The main idea is to have one suite, so there will be easier to maintain and introduce new features.
Introduce the prepare_sql option for suite.yaml to add possibility to run cql statements as precondition for the test suite.
Related: https://github.com/scylladb/scylladb/issues/18188

Closes scylladb/scylladb#18442

test.py

@@ -977,6 +977,9 @@ class PythonTest(Test):
         cluster = await self.suite.clusters.get(logger)
         try:
             cluster.before_test(self.uname)
+            prepare_cql = self.suite.cfg.get("prepare_cql", None)
+            if prepare_cql:
+                next(iter(cluster.running.values())).control_connection.execute(prepare_cql)
             logger.info("Leasing Scylla cluster %s for test %s", cluster, self.uname)
             self.args.insert(0, "--host={}".format(cluster.endpoint()))
             self.is_before_test_ok = True

test/alternator/conftest.py

@@ -45,7 +45,8 @@ def pytest_addoption(parser):
     # presence.
     parser.addoption('--omit-scylla-output', action='store_true',
         help='Omit scylla\'s output from the test output')
-
+    parser.addoption('--host', action='store', default='localhost',
+        help='Scylla server host to connect to')
 def pytest_configure(config):
     config.addinivalue_line("markers", "veryslow: mark test as very slow to run")
 
@@ -79,6 +80,9 @@ def dynamodb(request):
         # for local runs.
         if request.config.getoption('url') != None:
             local_url = request.config.getoption('url')
+        elif request.config.getoption('host') is not None:
+            # this argument needed for compatibility with PythonTestSuite without modifying the previous behavior
+            local_url = f"http://{request.config.getoption('host')}:8000"
         else:
             local_url = 'https://localhost:8043' if request.config.getoption('https') else 'http://localhost:8000'
         # Disable verifying in order to be able to use self-signed TLS certificates
@@ -114,6 +118,9 @@ def dynamodbstreams(request):
         # for local runs.
         if request.config.getoption('url') != None:
             local_url = request.config.getoption('url')
+        elif request.config.getoption('host') is not None:
+            # this argument needed for compatibility with PythonTestSuite without modifying the previous behavior
+            local_url = f"http://{request.config.getoption('host')}:8000"
         else:
             local_url = 'https://localhost:8043' if request.config.getoption('https') else 'http://localhost:8000'
         # Disable verifying in order to be able to use self-signed TLS certificates

test/alternator/suite.yaml

@@ -1 +1,24 @@
-type: Run
+type: Python
+pool_size: 4
+prepare_cql: INSERT INTO system_auth_v2.roles (role, salted_hash) VALUES ('alternator', 'secret_pass')
+run_first:
+    - test_streams
+    - test_scan
+    - test_tracing
+    - test_ttl
+extra_scylla_config_options:
+  {
+    experimental_features: [
+                             udf,
+                             alternator-streams,
+                             keyspace-storage-options,
+                             tablets
+    ],
+    alternator_port: 8000,
+    query_tombstone_page_limit: 1000,
+    alternator_write_isolation: only_rmw_uses_lwt,
+    alternator_enforce_authorization: True,
+    alternator_timeout_in_ms: 30000,
+    alternator_ttl_period_in_seconds: 0.5,
+    alternator_streams_time_window_s: 0
+  }