Fix tests using wrong method to check db existence (typedb#188)

## What is the goal of this PR?

Our tests were using the syntax: `if "grakn" in client.databases().all()` which no longer works, because `all()` now returns `Database` objects, not strings. We updated them to the new syntax: `if client.databases().contains("grakn")`.

## What are the changes implemented in this PR?

Fix tests using wrong method to check db existence

Author: Alex Walker

tests/deployment/test.py

@@ -41,16 +41,14 @@ def tearDownClass(cls):
         client.close()
 
     def setUp(self):
-        if "grakn" not in client.databases().all():
+        if not client.databases().contains("grakn"):
             client.databases().create("grakn")
 
     def test_database(self):
-        dbs = client.databases().all()
-        if "grakn" in dbs:
+        if client.databases().contains("grakn"):
             client.databases().get("grakn").delete()
         client.databases().create("grakn")
-        dbs = client.databases().all()
-        self.assertTrue("grakn" in dbs)
+        self.assertTrue(client.databases().contains("grakn"))
 
     def test_session(self):
         session = client.session("grakn", SessionType.SCHEMA)

tests/integration/test_cluster_failover.py

@@ -28,7 +28,7 @@ class TestClusterFailover(TestCase):
 
     def setUp(self):
         with GraknClient.cluster(["localhost:11729", "localhost:21729", "localhost:31729"]) as client:
-            if "grakn" in client.databases().all():
+            if client.databases().contains("grakn"):
                 client.databases().get("grakn").delete()
             client.databases().create("grakn")
 

tests/integration/test_concurrent.py

@@ -30,7 +30,7 @@ class TestConcurrent(TestCase):
 
     def setUp(self):
         with GraknClient.core() as client:
-            if "grakn" not in client.databases().all():
+            if not client.databases().contains("grakn"):
                 client.databases().create("grakn")
 
     def open_tx(self, session: Session, *args):

tools/cluster_test_rule.bzl

@@ -57,7 +57,7 @@ def _rule_implementation(ctx):
            ./1/grakn server --data data --address=127.0.0.1:11729:11730 --peers=127.0.0.1:11729:11730,127.0.0.1:21729:21730,127.0.0.1:31729:31730 &
            ./2/grakn server --data data --address=127.0.0.1:21729:21730 --peers=127.0.0.1:11729:11730,127.0.0.1:21729:21730,127.0.0.1:31729:31730 &
            ./3/grakn server --data data --address=127.0.0.1:31729:31730 --peers=127.0.0.1:11729:11730,127.0.0.1:21729:21730,127.0.0.1:31729:31730 &
-           sleep 15
+           sleep 20
 
            """