SAMP: Documentation does not match calling signature

While working on #1196 I discovered this and I could not make out what the extra parameters in the signature are supposed to do:

http://docs.astropy.org/en/latest/api/astropy.vo.samp.SAMPHubProxy.html#astropy.vo.samp.SAMPHubProxy.connect

http://docs.astropy.org/en/latest/api/astropy.vo.samp.SAMPHubServer.html#astropy.vo.samp.SAMPHubServer

@astrofrog