Allow connections to unix socket in example
Allow connections to unix socket in example

To minimize code changes, a simple `u` (or UNIX, Unix, unix, etc -- as
long as the first character is u or U) is used as a marker for the
'port' argument. In this case, the hostname is interpreted to be the
path to the unix socket.

redis/hiredis,redis/hiredis,redis/hiredis,jinguoli/hiredis,jinguoli/hiredis,jinguoli/hiredis