fedora: use dnf builddep instead yum-builddep

Change-Id: Iab011abd51859cdcfb30663fb8bd2fd44aa71bcd

docker/Dockerfile_fedora_26

 FROM fedora:26
 
 RUN dnf clean all
-RUN dnf install -y yum-utils rpmdevtools
+RUN dnf install -y dnf-command\(builddep\) rpmdevtools
 
 RUN dnf clean all
 RUN dnf upgrade -y && \

docker/Dockerfile_fedora_27

 FROM fedora:27
 
 RUN dnf clean all
-RUN dnf install -y yum-utils rpmdevtools
+RUN dnf install -y dnf-command\(builddep\) rpmdevtools
 
 RUN dnf clean all
 RUN dnf upgrade -y && \

docker/Dockerfile_fedora_28

 FROM fedora:28
 
 RUN dnf clean all
-RUN dnf install -y yum-utils rpmdevtools
+RUN dnf install -y dnf-command\(builddep\) rpmdevtools
 
 RUN dnf clean all
 RUN dnf upgrade -y && \

scripts/build-package-fedora.sh

@@ -33,7 +33,7 @@ sed -i "s/RELEASE_VERSION/${RELEASE_VERSION}/g" ring.spec
 rpmdev-bumpspec --comment="Automatic nightly release" --userstring="Jenkins <ring@lists.savoirfairelinux.net>" ring.spec
 
 # install build deps
-yum-builddep -y ring.spec || echo "ignoring yum-builddep failure"
+dnf builddep -y ring.spec || echo "ignoring dnf builddep failure"
 
 # place the source
 mkdir -p /root/rpmbuild/SOURCES