fluentd-ui: fixed build error (installed gnupg, dirmngr packages)
fluentd-ui: fixed build error (installed gnupg, dirmngr packages)

```
+ curl -L https://td-toolbelt.herokuapp.com/sh/install-debian-jessie-td-agent2.sh
+ sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   551  100   551    0     0    232      0  0:00:02  0:00:02 --:--:--   232
This script requires superuser access to install apt packages.
You will be prompted for your password by sudo.
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0E: gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation
100  3157  100  3157    0     0  19062      0 --:--:-- --:--:-- --:--:-- 19133
(23) Failed writing body
```

minimum2scp/dockerfiles,minimum2scp/dockerfiles,minimum2scp/dockerfiles