Filename is split as an URL path, and joined in OS-dependent manner.
Remove corresponding comment in all buildout.hash.cfg files.

See
https://docs.influxdata.com/influxdb/v1.4/administration/config/#bind-address-127-0-0-1-8088

This should not be reachable from outside because it can be used to pull
a backup.
Because we usually have reachable ipv6 and local only ipv4, make it
ipv4 and add a note in README because this is not always true.

Also make ports use explicit names in profile and fix promise that
should check http-port and not rpc-port

Otherwise telegraf start but does not create database and does not send
data:

```
2018-01-17T03:44:54Z I! Database creation failed: Post
https://[2001:67c:1254:e:....]:8086/query?q=CREATE+DATABASE+%22telegraf%22: dial tcp [2001:67c:1254:e:....]:8086: getsockopt: connection refused
2018-01-17T03:44:54Z I! Starting Telegraf v1.6.0~90b6b760
2018-01-17T03:44:54Z I! Loaded outputs: influxdb
2018-01-17T03:44:54Z I! Loaded inputs: inputs.cpu inputs.mem inputs.disk inputs.diskio inputs.system
2018-01-17T03:44:54Z I! Tags enabled: host=f114dfe44f75
2018-01-17T03:44:54Z I! Agent Config: Interval:10s, Quiet:false, Hostname:"f114dfe44f75", Flush Interval:10s
2018-01-17T03:45:10Z E! InfluxDB Output Error: Response Error: Status Code [404], expected [204], [database not found: "telegraf"]
2018-01-17T03:45:10Z E! Error writing to output [influxdb]: Could not write to any InfluxDB server in cluster
``