Merge pull request #378 from davidvossel/master

Fix: fencing: Deep copy current topology level list on remote op
Fix: ipc: Ensure buffer environment variable is read before setting max buffer len
Fix: ipc: Client buffer size must never fall below our max read size
Low: mainloop: Don't allow client buf size to be determined by hardcoded value given to mainloop
Merge pull request #377 from davidvossel/ipc_buf_size_detection

ipc buffer size related fixes