Add epel-rpm-macros for CentOS/RHEL install-dep

%py2_install is required by vpp-api-python and is not available on
bare CentOS/RHEL install, causing 'fg: no job control' error.
Added 'epel-rpm-macros' to the list of EPEL dependencies

Change-Id: I1e09d7d825d9d8db06e7385d2b8d5579c8ce748b
Signed-off-by: Alexander Popovsky (apopovsk) <apopovsk@cisco.com>
diff --git a/Makefile b/Makefile
index f47c98a..4454706 100644
--- a/Makefile
+++ b/Makefile
@@ -52,7 +52,7 @@
 RPM_DEPENDS += openssl-devel https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm apr-devel
 RPM_DEPENDS += python-devel python-virtualenv lcov chrpath libffi-devel
 RPM_DEPENDS += https://kojipkgs.fedoraproject.org//packages/nasm/2.12.02/2.fc26/x86_64/nasm-2.12.02-2.fc26.x86_64.rpm
-EPEL_DEPENDS = libconfuse-devel ganglia-devel
+EPEL_DEPENDS = libconfuse-devel ganglia-devel epel-rpm-macros
 
 ifneq ($(wildcard $(STARTUP_DIR)/startup.conf),)
         STARTUP_CONF ?= $(STARTUP_DIR)/startup.conf