playbook: yum-utils is required to use yum-config-manager

playbook/roles/install-script/templates/base_setup.j2

@@ -81,6 +81,7 @@ enabled=0
 gpgcheck=0
 EOF
     yum update
+    yum_install yum-utils
     # Enable a bootstrap repo.  It is removed after finishing
     # the epel-release installation.
     yum-config-manager --enable epel-bootstrap
@@ -110,6 +111,7 @@ enabled=0
 gpgcheck=0
 EOF
     yum update
+    yum_install yum-utils
     yum-config-manager --enable epel-bootstrap
     yum_install epel-release || \
         die $LINENO "Error installing EPEL repo, cannot continue"