(QENG-989,990) Clean up open source install rough edges

This ensures that puppet and friends are available after gem installs on
Solaris and Debian. It also makes sure that the config directory and
hiera.yaml file are aways present. The former change fixes QENG-989 while
the latter fixes QENG-990).
I'd prefer to get rid of the hieraconf value on host, but the `['hieraconf']` setting is older than the name 'beaker' so I don't know where it might be lurking in what tests, so I went ahead and made the hieraconf value on windows hosts.