Many files erroneously owned to jenkins:jenkins
Many files erroneously owned to jenkins:jenkins

This relates to the preceding commit and 8700952. The `File{}` directive was
intended to be shorthand for setting the owner and group on the three
file/directory resources that followed it.

However it introduced an excellent bug whereby it set the ownership of all
files, managed by all classes that `govuk::node::s_jenkins` includes and
where there wasn't an explicit owner/group param, to `jenkins:jenkins`
instead of `root:root`.

This becomes apparent when removing this commit and running Puppet. Here's
an example of some affected resources:
```
Notice: /Stage[main]/Nginx::Config/File[/etc/nginx/nginx.conf]/owner: owner changed 'jenkins' to 'root'
Notice: /Stage[main]/Nginx::Config/File[/etc/nginx/nginx.conf]/group: group changed 'jenkins' to 'root'
…
Notice: /Stage[main]/Collectd::Plugin::Nginx/Collectd::Plugin[nginx]/File[/etc/collectd/conf.d/nginx.conf]/owner: owner changed 'jenkins' to 'root'
Notice: /Stage[main]/Collectd::Plugin::Nginx/Collectd::Plugin[nginx]/File[/etc/collectd/conf.d/nginx.conf]/group: group changed 'jenkins' to 'root'
…
Notice: /Stage[main]/Govuk_java::Oracle7::Jdk/File[/var/cache/oracle-jdk7-installer]/owner: owner changed 'jenkins' to 'root'
Notice: /Stage[main]/Govuk_java::Oracle7::Jdk/File[/var/cache/oracle-jdk7-installer]/group: group changed 'jenkins' to 'root'
```

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet