Fixing kafka_port validation in RO charm

Change-Id: I5d7ea4ecd3f45e901d0da431e386580f5c49611c
Signed-off-by: sousaedu <eduardo.sousa@canonical.com>
diff --git a/installers/charm/ro/tests/test_charm.py b/installers/charm/ro/tests/test_charm.py
index cdc384f..0aa9b7d 100644
--- a/installers/charm/ro/tests/test_charm.py
+++ b/installers/charm/ro/tests/test_charm.py
@@ -91,7 +91,7 @@
                         "OSMRO_LOG_LEVEL": "INFO",
                         "OSMRO_MESSAGE_DRIVER": "kafka",
                         "OSMRO_MESSAGE_HOST": "kafka",
-                        "OSMRO_MESSAGE_PORT": 9090,
+                        "OSMRO_MESSAGE_PORT": "9090",
                         "OSMRO_DATABASE_DRIVER": "mongo",
                         "OSMRO_DATABASE_URI": "mongodb://mongo",
                         "OSMRO_DATABASE_COMMONKEY": "osm",
@@ -139,7 +139,7 @@
             "kafka/0",
             {
                 "host": "kafka",
-                "port": 9090,
+                "port": "9090",
             },
         )