fix add hosts key file

Author: marian-code

ssh_utilities/connection.py

@@ -243,6 +243,9 @@ def add_hosts(cls, hosts: Union["_HOSTS", List["_HOSTS"]]):
         for h in hosts:
             if not isinstance(h["identityfile"], list):
                 h["identityfile"] = [h["identityfile"]]
+            h["identityfile"] = os.path.abspath(
+                os.path.expanduser(h["identityfile"])
+            )
 
         cls.available_hosts.update({h["hostname"]: h for h in hosts})