remove fedora 27 because it is eol

Fedora 27 EOL 2018-11-30.

Signed-off-by: Andrew Hsu <andrewhsu@docker.com>
Upstream-commit: 53e5ace
Component: packaging

Author: andrewhsu

components/packaging/rpm/Makefile

@@ -63,7 +63,7 @@ clean: ## remove build artifacts
 rpm: fedora centos ## build all rpm packages
 
 .PHONY: fedora
-fedora: fedora-28 fedora-27 fedora-26 ## build all fedora rpm packages
+fedora: fedora-28 fedora-26 ## build all fedora rpm packages
 
 .PHONY: centos
 centos: centos-7 ## build all centos rpm packages