mgr/nfs: use helper to validate cephfs path

Signed-off-by: Dhairya Parmar <[email protected]>

Author: dparmar18

src/pybind/mgr/nfs/export.py

@@ -714,14 +714,7 @@ def create_cephfs_export(self,
                              clients: list = [],
                              sectype: Optional[List[str]] = None) -> Dict[str, Any]:
 
-        try:
-            cephfs_path_is_dir(self.mgr, fs_name, path)
-        except NotADirectoryError:
-            raise NFSException(f"path {path} is not a dir", -errno.ENOTDIR)
-        except cephfs.ObjectNotFound:
-            raise NFSObjectNotFound(f"path {path} does not exist")
-        except cephfs.Error as e:
-            raise NFSException(e.args[1], -e.args[0])
+        validate_cephfs_path(self.mgr, fs_name, path)
 
         pseudo_path = normalize_path(pseudo_path)