run dnf upgrade before installing in fedora

Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

contrib/builder/rpm/amd64/fedora-23/Dockerfile

@@ -4,6 +4,7 @@
 
 FROM fedora:23
 
+RUN dnf -y upgrade
 RUN dnf install -y @development-tools fedora-packager
 RUN dnf install -y btrfs-progs-devel device-mapper-devel glibc-static libseccomp-devel libselinux-devel libtool-ltdl-devel pkgconfig selinux-policy selinux-policy-devel sqlite-devel systemd-devel tar git cmake vim-common
 

contrib/builder/rpm/amd64/fedora-24/Dockerfile

@@ -4,6 +4,7 @@
 
 FROM fedora:24
 
+RUN dnf -y upgrade
 RUN dnf install -y @development-tools fedora-packager
 RUN dnf install -y btrfs-progs-devel device-mapper-devel glibc-static libseccomp-devel libselinux-devel libtool-ltdl-devel pkgconfig selinux-policy selinux-policy-devel sqlite-devel systemd-devel tar git cmake vim-common
 

contrib/builder/rpm/amd64/fedora-25/Dockerfile

@@ -4,6 +4,7 @@
 
 FROM fedora:25
 
+RUN dnf -y upgrade
 RUN dnf install -y @development-tools fedora-packager
 RUN dnf install -y btrfs-progs-devel device-mapper-devel glibc-static libseccomp-devel libselinux-devel libtool-ltdl-devel pkgconfig selinux-policy selinux-policy-devel sqlite-devel systemd-devel tar git cmake vim-common
 

contrib/builder/rpm/amd64/generate.sh

@@ -53,6 +53,9 @@ for version in "${versions[@]}"; do
 			echo "RUN yum install -y kernel-uek-devel-4.1.12-32.el6uek"  >> "$version/Dockerfile"
 			echo >> "$version/Dockerfile"
 			;;
+		fedora:*)
+			echo "RUN ${installer} -y upgrade" >> "$version/Dockerfile"
+			;;
 		*) ;;
 	esac