Merge pull request #97 from twonds/reltool-error

Module tls potentially included by two different applications: ejabberd and ssl.
Merge branch 'master' of https://github.com/esl/ejabberd
Adapted ejabber_service.erl for components support. taken from https://github.com/f355/ejabberd/commit/4b1be36f89632652efac7b064fbe0e1591617532
Merge branch 'ejabberd_service-90'