[tune] Sync logs from workers and improve tensorboard reporting (#1567)

python/ray/tune/cluster_info.py

@@ -0,0 +1,23 @@
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import getpass
+import os
+
+
+def get_ssh_user():
+    """Returns ssh username for connecting to cluster workers."""
+
+    return getpass.getuser()
+
+
+# TODO(ekl) this currently only works for clusters launched with
+# ray create_or_update
+def get_ssh_key():
+    """Returns ssh key to connecting to cluster workers."""
+
+    path = os.path.expanduser("~/ray_bootstrap_key.pem")
+    if os.path.exists(path):
+        return path
+    return None