Add % instead of the default 'localhost' since we use remote connection

Previously, everything was on localhost. Now ansible-test is in a
venv and the db is in a container. The db see the IP address from the
podman host (10.88.0.2)

tests/integration/targets/test_mysql_db/tasks/state_dump_import.yml

@@ -36,6 +36,7 @@
     login_host: 127.0.0.1
     login_port: '{{ mysql_primary_port }}'
     name: '{{ db_user }}'
+    host: '%'
     password: '{{ db_user_unsafe_password }}'
     priv: '*.*:ALL'
     state: present

tests/integration/targets/test_mysql_db/tasks/state_present_absent.yml

@@ -179,6 +179,7 @@
     login_host: 127.0.0.1
     login_port: '{{ mysql_primary_port }}'
     name: user1
+    host: '%'
     password: 'Hfd6fds^dfA8Ga'
     priv: '*.*:ALL'
     state: present

tests/integration/targets/test_mysql_user/tasks/test_user_password.yml

@@ -24,6 +24,7 @@
       mysql_user:
         <<: *mysql_params
         name: '{{ test_user_name }}'
+        host: '%'
         password: '{{ initial_password }}'
         priv: '{{ test_default_priv }}'
         state: present