Add support for a realtime sorcery module.

This change does the following:

1. Adds the sorcery realtime module
2. Adds unit tests for the sorcery realtime module
3. Changes the realtime core to use an ast_variable list instead of variadic arguments
4. Changes all realtime drivers to accept an ast_variable list

Review: https://reviewboard.asterisk.org/r/2424/


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@386731 f38db490-d61c-443f-a65b-d21fe96a405b