[#281] add hostname to HostConfig

Signed-off-by: m.malygina <m.malygina@yadro.com>

.devenv.hosting.yaml

@@ -1,5 +1,6 @@
 hosts:
 - address: localhost
+  hostname: localhost
   attributes:
     sudo_shell: false
   plugin_name: docker

src/frostfs_testlib/hosting/config.py

@@ -60,6 +60,7 @@ class HostConfig:
     """
 
     plugin_name: str
+    hostname: str
     healthcheck_plugin_name: str
     address: str
     s3_creds_plugin_name: str = field(default="authmate")