configs: Move sample config files into a subdirectory of configs

This moves all samples configs from configs/ to configs/samples. This allows
for additional sets of sample configuration files to be added in the future.

Review: https://reviewboard.asterisk.org/r/3804/


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@418870 f38db490-d61c-443f-a65b-d21fe96a405b