Include RequestID in succesful service responses
Include RequestID in succesful service responses

Updates the query protocol unmarshaler to extract the RequestID in both
succesful and failure cases.

Fix #311

xibz/aws-sdk-go,rosenhouse/aws-sdk-go,myshen/aws-sdk-go,zmarois/aws-sdk-go,zmarois/aws-sdk-go,aws/aws-sdk-go,rosenhouse/aws-sdk-go,yxd-hde/aws-sdk-go,calgaryscientific/aws-sdk-go,jjeffery/aws-sdk-go,yxd-hde/aws-sdk-go,calgaryscientific/aws-sdk-go,agworld/aws-sdk-go,xibz/aws-sdk-go,myshen/aws-sdk-go,jjeffery/aws-sdk-go,radeksimko/aws-sdk-go,yxd-hde/aws-sdk-go,agworld/aws-sdk-go,yxd-hde/aws-sdk-go,zmarois/aws-sdk-go,radeksimko/aws-sdk-go,calgaryscientific/aws-sdk-go,jasdel/aws-sdk-go,myshen/aws-sdk-go,zmarois/aws-sdk-go,agworld/aws-sdk-go,calgaryscientific/aws-sdk-go,agworld/aws-sdk-go,radeksimko/aws-sdk-go,jjeffery/aws-sdk-go,myshen/aws-sdk-go,xibz/aws-sdk-go,rosenhouse/aws-sdk-go,xibz/aws-sdk-go,radeksimko/aws-sdk-go