make sample config files easier to ready (issue #5371)

configs/alarmreceiver.conf.sample

configs/codecs.conf.sample

configs/extensions.conf.sample

configs/iax.conf.sample

configs/iaxprov.conf.sample

configs/indications.conf.sample

configs/logger.conf.sample

configs/manager.conf.sample

configs/meetme.conf.sample

configs/mgcp.conf.sample

configs/modules.conf.sample

configs/musiconhold.conf.sample

configs/queues.conf.sample

configs/sip.conf.sample

configs/voicemail.conf.sample

configs/vpb.conf.sample

configs/zapata.conf.sample