disable lint_message_convention test inside the rustc test suite
disable lint_message_convention test inside the rustc test suite

aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust