Added option for config elliptics remotes addr family

Author: Ilya Rusalowski

README.md

@@ -155,6 +155,7 @@ to `elliptics`.
 1. `elliptics_groups`: Elliptics groups registry should use
 1. `elliptics_verbosity`: Elliptics logger verbosity (0...4)
 1. `elliptics_logfile`: path to Elliptics logfile (default: `dev/stderr`)
+1. `elliptics_addr_family`: address family to use when adding Elliptics remotes (default: `2` (for ipv4)). Use 10 for ipv6 remotes on Linux.
 
 Example:
 ```yaml

lib/storage/ellipticsbackend.py

@@ -55,7 +55,7 @@ def __init__(self, config):
         at_least_one = False
         for host, port in config.get('elliptics_nodes').iteritems():
             try:
-                self._elliptics_node.add_remote(host, port)
+                self._elliptics_node.add_remote(host, port, config.get('elliptics_addr_family', 2))
                 at_least_one = True
             except Exception as err:
                 logger.error("Failed to add remote %s:%d %s", host, port, err)