try to append to a *list* of protocols in LLRPClientFactory's parent

if that fails, fall back to setting parent.protocol
port must be an int (thanks JY for patch)
Added additional error codes to Error_Name2Type in llrp_proto.py
Merge branch 'master' of https://github.com/ransford/sllurp
Merge pull request #3 from daemacles/master

Added additional error codes
Merge branch 'master' into capabilities
UHFRFModeTable