::tftp module is not optional

[pkranenburg]

Despite setting parameter 'tftp_manage' to false, the module still insists on including ::tftp::params.
This should not happen and can presumably be fixed easily by these modifications:

In params.pp: don't include ::tftp::params
In tftp:pp: lazily evaluate variable 'tftp_root':
if ($foreman_proxy::tftp_root == undef) {
initialize from tftp::params
} else {
use main parameter value
}

[pkranenburg]

Ok, this issue appears to have been resolved in the current version on github.

I'll retract this issue (#270) and wait for the release to appear.

[ekohl]

@domcleal or @mmoll should we do a release?

[mmoll]

maybe after #267 ?