add IPCBinderror exception
add IPCBindError exception
add exceptions concluding IPCConnetError,IPCCreatError and IPCBindError.
check if connect() has been called
add considered exceptions
add some exceptions considered in ipc.h
add some exceptions considered
add some exceptions considered
add exceptions considered
add  three exceptions considered
Merge branch '4o6' of https://github.com/gnocuil/kea into 4o6
Merge pull request #4 from asdassZY/4o6

[4o6] add exceptions for BaseIPC