- changed conference pattern to 7{4} as it is what's dynamically generated by demo

 - switch SIP ports in vars.xml:
   - Internal to port 5090 from port 5060. 5060 is assigned to external sip profile
     as bbb-voice only connects to 5060. Tried fixing bbb-voice but can't figure it out.
   - Use 5090 instead of 5080 since 5080 is used by Red5.