(maint) Change dev-puppet-master script not to log debug and trace

It is more useful to set this yourself when calling the script,
depending on whether you want --verbose or --debug and/or --trace.
So just:

$ util/dev-puppet-master foo --debug --trace

Also fixed copying of auth.conf (from basic case running script from
repository root).
Merge pull request #2658 from jpartlow/maint/master/util-dev-puppet-master-no-loglevel-defaults

(maint) Change dev-puppet-master script not to log debug and trace
Merge branch 'master' of https://github.com/puppetlabs/puppet