Merge pull request #747 from kuba/rpm-dnf

rpm bootstrap: yum and dnf support

bootstrap/_rpm_common.sh

@@ -4,8 +4,19 @@
 #   - Fedora 22 (x64)
 #   - Centos 7 (x64: on AWS EC2 t2.micro, DigitalOcean droplet)
 
+if type yum 2>/dev/null
+then
+  tool=yum
+elif type dnf 2>/dev/null
+then
+  tool=dnf
+else
+  echo "Neither yum nor dnf found. Aborting bootstrap!"
+  exit 1
+fi
+
 # "git-core" seems to be an alias for "git" in CentOS 7 (yum search fails)
-yum install -y \
+$tool install -y \
   git-core \
   python \
   python-devel \