Allow setup=passive in ACM for helping interoperability

Ignore-this: 8f83c792fe6bcdc04ddc412dc6d6cb35

darcs-hash:20100617112843-56b4d-0ceefdc293017d27bb517eb93ec85b07afa17847
Refactor initalizing MSRP connector

Ignore-this: 8f82f679304fb2cc4d5c5c43cbefee3b

darcs-hash:20100617144037-56b4d-caa7afd1f5b565758f5c4b5d07dea2bc708e28ea