http://www.gcasino.co.uk/coventry/
You could go to the "G Casino" which is part of the Ricoh arena Complex... but for away friendly pubs I don't know sorry... Im sure someone else will know one for you... Or you could try asking other Norwich fans which have traveled to cov games before for away friendly pubs?
The Black Horse, Situated between Longford and Exhall, is reported to offer a friendly welcome to away fans. Many of the pubs along Longford Road are "home only," but the JK English pub is an exception, providing a hearty welcome for visiting supporters.
It can be reached by following the towpath away from the North Stand over the canal for some 400 yards and turning right into Longford Road. The pub is some 200 yards, on the right. It offers an "all you can eat" buffet on Saturday lunchtimes. Reasonably priced parking is also available at this pub. Alternativly, alcohol is available inside the stadium